Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Question: When did the event that help cause Columbia, PA to go into decline begin? Passage 1:Columbia, formerly Wright's Ferry, is a borough (town) in Lancaster County, Pennsylvania, 28 miles (45 km) southeast of Harrisburg on the east (left) bank of the Susquehanna River, across from Wrightsville and York County and just south of U.S. Route 30. The settlement was founded in 1726 by Colonial English Quakers from Chester County led by entrepreneur and evangelist John Wright. Establishment of the eponymous Wright's Ferry, the first commercial Susquehanna crossing in the region, inflamed territorial conflict with neighboring Maryland but brought growth and prosperity to the small town, which was just a few votes shy of becoming the new United States' capital. Though besieged for a short while by Civil War destruction, Columbia remained a lively center of transport and industry throughout the 19th century, once serving as a terminus of the Pennsylvania Canal. Later, however, the Great Depression and 20th-century changes in economy and technology sent the borough into decline. It is notable today as the site of one of the world's few museums devoted entirely to horology.
 Passage 2:On 27 August, a squadron of the Royal Naval Air Service (RNAS) flew to Ostend, for reconnaissance sorties between Bruges, Ghent and Ypres. Royal Marines landed at Dunkirk on the night of and on 28 September, a battalion occupied Lille. The rest of the brigade occupied Cassel on 30 September and scouted the country in motor cars; an RNAS Armoured Car Section was created, by fitting vehicles with bullet-proof steel. On 2 October, the Marine Brigade was sent to Antwerp, followed by the rest of the 63rd (Royal Naval) Division on 6 October, having landed at Dunkirk on the night of From the 7th Division and the 3rd Cavalry Division landed at Zeebrugge. Naval forces collected at Dover were formed into a separate unit, which became the Dover Patrol, to operate in the Channel and off the French-Belgian coast.
 Passage 3:Political families started becoming more apparent in the national political scene after World War II and gradually turned into hereditary politics, especially in the provinces. In 1946, Vicente Sotto became a senator after his brother Filemon Sotto previously held a position in the Senate before the war. The 60s saw more frequent instances of relatives getting elected in the Senate such as the election of the brother of then President Ramon Magsaysay; of Magnolia Antonino as Senator after her husband Senator Gaudencio died; of Sergio Osmeña Jr. who was the son of 4th President Sergio Osmeña Sr.; of Gerardo Roxas who was another son of a previous president; and of Benigno Aquino Jr. who was the son of Benigno Sr.. During the martial law years, it only became worse as Marcos named his wife Imelda as the governor of Metro Manila while his son Bongbong became the governor of Ilocos Norte.

Student:
1