Detailed Instructions: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Problem:Question: What is the surface area of the body of water that the Royal Navy secured the approaches to after the outbreak of the First World War?   Passage 1:USS Sachem was originally commanded by Captain H. W. Morris, the former U.S. Navy commander of New Orleans, and was armed with one 20 lb (0.91 kg) parrott rifle and four 32 pounder (15 kg) cannons. The size of her crew was about fifty; she had also participated in several other historic naval engagements such as Hampton Roads and the Battle of Forts Jackson and St. Philip. Captain Morris is not believed to have fought in this battle. Lieutenant Amos Johnson commanded Sachem. Lieutenant John W. Kittredge was in charge of Arthur, which held over eighty men and was armed with six 32 pounder smooth-bore guns. Kittredge commanded the flotilla and Arthur was the flagship of the force. Corypheus mounted one 30 lb (14 kg) rifled gun and one 24 pounder (11 kg) howitzer. She had a crew of twenty-eight men and was commanded by Acting Master A. T. Spear. Bella Italias armament and crew are not known. Reindeer mustered six 24 pounder howitzers. Little is known of the Confederate ships.
 Passage 2:The two premaxillae are very long and run up over the snout to meet the prefrontals at the orbit. At the anterior tip they are narrow and triangular in cross-section. They form the classic rhynchosaurian beak, and there is evidence on the fossil showing that it was probably covered by a keratinous sheath. The maxilla carries a massive tooth plate and has numerous foramina for nerves and blood vessels to reach the gums through. Many of the posterior and lateral teeth are unworn from use, unlike the more anterior teeth which have been worn smooth. The nasal bones are large, but no wider than the frontals. They form a pointed posterior tip with a strong zigzag suture. The lacrimal ducts are clearly visible next to the orbit, while the lacrimal bones form much of the interior surface of the orbit. The prefrontal forms a thick eyebrow ridge, possibly as protection from predators. The jugal is complex, with four branches, and forms the anterior and ventral margins of the lower temporal fenestra. The dorsal branch forms a strong pillar behind the orbit, which has a more pronounced crest than other rhynchosaurs. The frontals are very long, and form a dish shape posteriorly. The postfrontal is triangular and forms part of the back of the orbit. The parietals are fused and have a high narrow ridge dorsally, with lateral wings extending across the upper temporal fenestrae. The postorbitals are roughly T-shaped, with three branches. Unlike Late Triassic forms, Fodonyx has a supratemporal bone. The quadratojugal and quadrate are mainly missing. One squamosal is preserved, forming much of the posterior margin of the skull. Much of the palate is intact, although the vomeronasals are quite degraded due to their length and thinness. The palatines form most of the borders of the choana. The pterygoids are very large and have three main processes, all broad and flat. The ectopterygoids are very small and hidden in palatal view. Small fragments of the hyoids are preserved, with a circular cross section and lateral striations. The basioccipital is short and attached to the narrow basisphenoid. The occipital condyle is hemispherical. Much of the detail on the paraoccipital is hard to make out due to difficulties of preparation. Only the anterior portions of the lower jaw are well preserved, but it has the typical rhynchosaur shape, curving up to the anterior tip. Teeth are mainly obscured as the jaws are tightly shut. The splenial is narrow except at the tip where it supports the symphyseal plate.
 Passage 3:After the outbreak of the First World War, a priority for the Royal Navy was to secure the approaches to the English Channel, to prevent elements of the German High Seas Fleet from breaking out into the Atlantic, or from interfering with British maritime trade and convoys to the continent. Most of the major fleet units of the Grand Fleet had dispersed to the navy's anchorage at Scapa Flow or to other North Eastern ports to monitor the northern route from the North Sea into the Atlantic. Consequently, a number of patrol flotillas were organised along the south and east coasts of England, with commands established at several of the major ports in the region. The Dover Patrol was based at Dover, consisting mostly of destroyers, while a number of pre-dreadnoughts and cruisers were based at Portland Harbour. A large number of destroyers, flotilla leaders and light cruisers were centred at Harwich, under the command of Commodore Reginald Tyrwhitt.

Solution:
3