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.
Q: Question: How many died at the Battle of Tirad Pass on the day Gregorio del Pilar was killed? Passage 1:On July 6, 1940, Karl Timmermann enlisted in the U.S. Army. He was stationed at Fort Lewis, Washington and assigned to the 15th Infantry Regiment of the 3rd Infantry Division. After the Japanese military attacked Pearl Harbor, his unit began training for war. The 3rd Infantry Division, with the 41st Infantry Division, were then part of IX Corps. In May 1941, the two divisions moved to the Hunter Liggett Military Reservation where June war games pitted them against Major General Joseph Stilwell's 7th Division and the 40th Division. Large scale maneuvers continued in August on the Olympic Peninsula, with IX Corps defending Tacoma, Washington until the two divisions from California could arrive to assist.
 Passage 2:After the battery returned from the Philippines in 1899, March was assigned as the aide to Major General Arthur MacArthur, Jr. during the Philippine–American War. Later that year he was promoted to major. He continued to serve in the Philippines, participated as part of General Loyd Wheaton's expedition in battles at San Fabian, Buntayan Bridge and San Jacinto. He commanded the U.S. forces in the Battle of Tirad Pass, 2 December 1899, where General Gregorio del Pilar was killed, and received the surrender of General Venacio Concepción, Chief of Staff to Philippine President Aguinaldo at Cayan, 5 December 1899. He served as provincial governor of districts including Lepanto-Bontoc and Ilocos Sur from February to June 1900, and then the Abra Province from June 1900 to February 1901. He then served as Commissary General of Prisoners for the Philippine Islands through 30 June 1901, when he mustered out of the U.S. Volunteers.
 Passage 3:In his spare time during his working life, he climbed the Cape Peninsula mountains, the Hottentots-Holland mountains, and nearby ranges, all of which are spectacular examples of Fynbos, including Peninsula Granite Fynbos, Peninsula Sandstone Fynbos and a number of related biomes. Later, when the railway administration moved to Johannesburg, he continued his explorations in various parts of the Drakensberg mountains, as well as on visits to Lesotho. On such excursions he collected avidly and sent specimens to Dr Rudolf Marloth. He extended his explorations to other regions as well; for example, while climbing the Cockscomb Mountains in the Winterberg range near Uitenhage he discovered a hitherto unrecognised species of Protea, later named Protea dykei Phill (now seen as a synonym of Protea rupicola). On Matroosberg in the Hex River Mountains, he discovered a new species of "everlasting", flowers that in those days were generally included in the genus Helichrysum. That species was described by Harry Bolus under the name Helichrysum dykei Bolus. The genus has since been split however, and the species has been assigned to another genus, as Syncarpha dykei (Bolus) B. Nord. Dyke's name also appears in the names of Erica dykei L. Bolus (= Erica thodei Gilg) and Lessertia dykei L. Bolus.

A:
2