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: How much before the IXB submarines came out did the IX submarines come out? Passage 1:Vranica is a mountain range in the Dinaric Alps of central Bosnia and Herzegovina, located between the town of Gornji Vakuf in the west and the town of Fojnica in the east, within the territory of the Federation. The highest peak is Nadkrstac at . Geologically, the Vranica range is part of the Dinaric Alps and formed largely of secondary and tertiary sedimentary rock, mostly limestone. Notable peaks are Nadkrstac (2110 m.), Locika (2106 m.), Rosinj (2059 m.) and Scit (1949 m.). Thick shrubs of Pinus Mugo replace mixed forest -mostly beech- above 1400 m. The typical karst characteristics of the nearby Herzegovina mountains is relatively absent in Vranica, which has relatively abundant water sources. Streams that source from these mountains are the Dragača in the east, the Vrbas in the west. 
 Passage 2:The Rams turned in a dominant performance over the NFC West rival Cardinals at London's Twickenham Stadium for their first-ever regular season victory outside the United States. Jared Goff threw for 235 yards and had a touchdown pass to Cooper Kupp (four receptions, 51 yards), with one interception. Goff also scored on a 9-yard run as the Rams built a 23-0 halftime lead. Todd Gurley had his fourth 100-yard rushing game of the season with 22 carries for 106 yards and a touchdown, plus four receptions for 48 yards. The Rams defense shut down Cardinals running back Adrian Peterson (12 carries, 21 yards) for the game and allowed only 196 total yards to Arizona. Cardinals quarterback Carson Palmer was hit hard by Rams linebacker Alec Ogletree as he threw late in the second quarter and the pass was picked off by Lamarcus Joyner to set up a Todd Gurley touchdown run. Palmer suffered a broken left arm on the play and was knocked out for the year (Palmer retired following the season). Mark Barron added another interception off Drew Stanton to set up the third of Greg Zuerlein's four field goals on the day. It was the Rams' first shutout victory since 2014, and their first-ever win in the NFL International Series. It was also one of two NFL London Games of the 2017 season to end in a shutout, the other being the New Orleans Saints' 20-0 victory over the Miami Dolphins in Wembley Stadium in Week 4.
 Passage 3:German Type IXB submarines were slightly larger than the original German Type IX submarines, later designated IXA. U-109 had a displacement of when at the surface and while submerged. The U-boat had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to .

Output:
3