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.
Input: Question: Who did the reinforcements oppose in the Battle of the Dneiper? Passage 1:The business was founded in 1953, when Ottavio and Rosita Missoni set up a small knitwear workshop in Gallarate, Italy. They presented their first collection under the Missoni label in Milan in 1958. The business prospered, with the support of fashion editor Anna Piaggi, then at Arianna magazine. Rosita met the French stylist Emmanuelle Khanh in New York in 1965, which led to a collaboration and a new collection the following year. In April 1967, they were invited to show at the Pitti Palace in Florence. Rosita told the models to remove their bras, supposedly because they were the wrong color, and showed through the thin lamé blouses. The material became transparent under the lights and caused a sensation. The Missonis were not invited back the following year, but the business grew; a new factory in Sumirago was built in 1969. Missoni designs were championed in the USA by Diana Vreeland, editor of American Vogue, and a Missoni boutique was opened in Bloomingdales.
 Passage 2:The corps was formed as part of the 34th Army of the Northwestern Front on 15 July 1943 under the command of Major General Pavel Kuznetsov, who led it for the rest of the war. It initially existed as a headquarters without assigned troops, and transferred to the Reserve of the Supreme High Command in August with the 1st and 10th Guards Airborne Divisions. In September it was transferred to the 37th Army of the Steppe Front (the 2nd Ukrainian Front from 20 October), being reinforced by the 188th Rifle Division. The corps fought in the capture of Left-bank Ukraine east of Kremenchuk, then crossed the Dnieper and captured a bridgehead northwest of Mishurin Rog during the Battle of the Dnieper. Between October and December it attacked towards Krivoi Rog. The 1st Guards Airborne was replaced by the 89th Guards Rifle Division in October, and the latter was replaced by the 28th Guards Rifle Division the following month. The 15th Guards Rifle Division replaced the 10th Guards Airborne in January 1944.
 Passage 3:Stay Alive was launched on November 22, 2011 at Patio Carlitos, White House, Quezon City. Nina sang three songs from the album including the lead single "Dance", which she performed with choreographed dance moves. She also performed the critically acclaimed ballad, "However Much Love", and her own composition, "You Should Know". On December 1, 2011, she promoted her album on Happy Yipee Yehey! after performing the song live, where she also did a duet with the show's host Randy Santiago. On December 11, 2011, she launched the album in Party Pilipinas, the rival program of variety show ASAP which she became part of. She performed "Dance" with Frencheska Farr and Julie Anne San Jose. She also guested in Joe D' Mango's midnight radio show on DZMM entitled LoveNotes, where she sang a few songs from the album including "Hagkan", "Laging Ikaw" and "However Much Love". Also, the music video for "Dance" had its nationwide premiere during the show. The episode aired on December 13, 2011. On New Year's Eve 2012, the song was played inside Big Brother's house on . On January 29, 2012, Stay Alive Mall Tour had its first leg at Market! Market! Taguig, where Nina performed most of the album songs with intensive choreography including "Dance", "Staying Alive" and "Only with You". On February 5, 2012, she promoted the album at SM City Baguio as part of the mall tour, where she performed "Dance" and other Stay Alive songs. She also sang her number-one hits "Love Moves in Mysterious Ways" and "Someday".

Output:
2