Given the task definition and input, reply with output. 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.

Question: Who was the ruler of Prague the year young Alfred was sent there? Passage 1:Recovering from his wounds, Mends joined HMS Conqueror and fought at the Battle of Dominica, where he was again seriously wounded after being struck in the head by a wooden splinter. Mends remained in service at the end of the war and joined HMS Grampus in 1786, under Commodore Edward Thompson off the African coast. In 1789 he was promoted to lieutenant and spent time on the brig HMS Childers in the English Channel. At the outbreak of the French Revolutionary Wars in 1793, Mends was serving on the ship of the line HMS Colossus in the Mediterranean and was present at the Siege of Toulon. In 1795, Colossus joined the Channel Fleet and fought at the Battle of Groix, at which Mends was caught in a large explosion that left him very badly burned.
 Passage 2:Empire Battleaxe was transferred under the terms of lend lease shortly after being completed. She was chartered by the Ministry of War Transport and operated under the management of Cunard White Star Line. She came to the United Kingdom as part of Convoy HX267, which departed New York on 19 November 1943. Empire Battleaxe was carrying a cargo of fish She took part in exercises in the Cromarty Firth and Moray Firth to train troops in preparation for the invasion of France. In May 1944, she took part in an exercise near Littlehampton. She took part in the Normandy Landings carrying part of 537 LCA Flotilla, carrying troops to Sword Beach. The flotilla that Empire Battleaxe was in consisted of four ships, the others being , and . Empire Battleaxe was close to HNoMS Svenner when that ship was torpedoed and sunk by E-boats. Among those she carried to Normandy was the actor David Niven. After landing her troops, Empire Battleaxe returned to the United Kingdom to collect a second wave of troops. Empire Battleaxe was then commissioned into the Royal Navy as HMS Empire Battleaxe.
 Passage 3:Piccaver was born on 5 February 1884 in the Lincolnshire town of Long Sutton to chemist Frederick Herman Piccaver (born 1864, died 17 February 1916) and his wife Sarah Ann Sissons. The Piccavers had been farm laborers, but there were also claims of Spanish ancestry dating back to the Spanish Armada. At a young age, Alfred emigrated with his family to the United States of America. The family resettled in Albany, NY and took American citizenship. Frederick Piccaver worked as head brewer of the Beverwyck Brewery. Alfred joined the choir of Albany's St. Peter's Episcopal Church as a boy soprano. He also became a soloist at the North Reformed Church in Watervliet. The young Piccaver went on to study voice with S. Graham Nobbes, who had been chief instructor of the Emma Willard Conservatory of Music and with Allan Lindsay, conductor of the Troy Conservatory of Music. Alfred later trained to be electrical engineer but he had a talent for singing and in 1905 he enrolled at the Metropolitan School of Opera. The school's director Heinrich Conried recognised his considerable vocal ability and in 1907 sent the young Alfred to Prague, where he studied with Ludmilla Prochazka-Neumann (1872–1954).
3