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: How long did the fight last in which Liu Bei and Cao Cao defeated Lü Bu? Passage 1:Liu Bei and his oath brothers Guan Yu and Zhang Fei swore allegiance to the Han Empire in the Oath of the Peach Garden and pledged to do their best for the people. However, their ambitions were not realised as they did not receive due recognition for helping to suppress the Yellow Turban Rebellion and participating in the campaign against Dong Zhuo. After Liu Bei succeeded Tao Qian as the governor of Xu Province, he offered shelter to Lü Bu, who had just been defeated by Cao Cao. However, Lü Bu betrayed his host, seized control of the province and attacked Liu Bei. Liu Bei combined forces with Cao Cao and defeated Lü Bu at the Battle of Xiapi. Liu Bei then followed Cao Cao back to the imperial capital, Xu, where Emperor Xian honoured him as his "Imperial Uncle". When Cao Cao showed signs that he wanted to usurp the throne, Emperor Xian wrote a secret decree in blood to his father-in-law, Dong Cheng, and ordered him to get rid of Cao. Dong Cheng secretly contacted Liu Bei and others and they planned to assassinate Cao Cao. However, the plot was leaked out and Cao Cao had Dong Cheng and the others arrested and executed along with their families.
 Passage 2:The most dramatic match came in the qualifying rounds when Terry Griffiths, a newly turned professional was beaten 8–9 by Rex Williams after leading 8–2. The championship proper also provided plenty of surprises. Patsy Fagan, the defending UK champion went out 7–9 in the first round to David Taylor who, after a decade in the professional ranks, reached his first major final by beating Alex Higgins 9–5 in the semi-final. In the other half, Roy Andrewartha beat John Spencer 9–8 and Willie Thorne beat Ray Reardon 9–6 only to collapse 1–9 against Graham Miles, whose 139 break set a tournament record. In the semi-finals it was Miles' turn to collapse 1–9 to Doug Mountjoy who, keeping his best till last, clinched his final victory over Taylor with a break of 120. The BBC televised the final again shown on Grandstand and with Ted Lowe commentating the match. The highest break of the tournament was 139 made by Graham Miles.
 Passage 3: arena was the site of several historic sporting events, including the professional debut of Sonja Henie, fresh from her triumph in the 1936 Winter Olympics. Roy Rogers, cowboy movie star, performed in his first rodeo at the Philadelphia arena in 1943. The Roy Rogers Rodeo played the Arena every season for more than 20 years, and in 1946, when a young cowgirl died after riding a bucking bronco, her funeral was held there. Rogers and the Sons of Pioneers sang "Roundup in the Sky", and after the closing prayer, everybody rode out to the cemetery. It was also the home of the Philadelphia Sports Writers Association Banquet. Professionally, the arena was the home of the Philadelphia Quakers of the NHL in their only season, 1930–1931, as well as home ice for several minor league hockey teams such as the Philadelphia Arrows, Philadelphia Ramblers, the Philadelphia Comets, the Philadelphia Falcons/Philadelphia Rockets and the Philadelphia Ramblers (EHL), as well as the Philadelphia Warriors and part-time home of the Philadelphia 76ers of the NBA when the Philadelphia Convention Center was unavailable.

Student:
1