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: How old was Bertold V when the construction of Freiburger Münster began? Passage 1:This town was strategically located at a junction of trade routes between the Mediterranean Sea and the North Sea regions, and the Rhine and Danube rivers. In 1200, Freiburg's population numbered approximately 6,000 people. At about that time, under the rule of Bertold V, the last duke of Zähringen, the city began construction of its Freiburg Münster cathedral on the site of an older parish church. Begun in the Romanesque style, it was continued and completed 1513 for the most part as a Gothic edifice. In 1218, when Bertold V died, then Egino V von Urach, the count of Urach assumed the title of Freiburg's count as Egino I von Freiburg. The city council did not trust the new nobles and wrote down its established rights in a document. At the end of the thirteenth century there was a feud between the citizens of Freiburg and their lord, Count Egino II of Freiburg. Egino II raised taxes and sought to limit the citizens' freedom, after which the Freiburgers used catapults to destroy the count's castle atop the Schloßberg, a hill that overlooks the city center. The furious count called on his brother-in-law the Bishop of Strasbourg, Konradius von Lichtenberg, for help. The bishop responded by marching with his army to Freiburg.
 Passage 2:He grew up at Nordberg, and originally wanted to become a priest. He was active in the Norwegian Christian Student Association while studying. He graduated with the cand.jur. degree from the University of Oslo in 1986. He left a job as research assistant there to do his compulsory military service, then work in the police. In 1988 he was hired as a police inspector for Senja, and from 1990 to 1991 he was an acting judge at Trondenes and Oslo District Courts. From 1991 to 2001 he was a public prosecutor in the Norwegian National Authority for the Investigation and Prosecution of Economic and Environmental Crime (Økokrim). His work mainly concerned environmental crime. He edited and wrote books during this period, and launched the periodical Miljøkrim. He had short interruptions from this position to be acting presiding judge in Eidsivating in 1993, acting assisting director in the Norwegian Directorate for Cultural Heritage in 1997 and acting general prosecutor in the Norwegian Army in 2001.
 Passage 3:Henrietta Melia Larson was born in Ostrander, Minnesota on 24 September 1894, sister of Agnes Larson. She received her B.A. from St. Olaf College in 1918 and taught one year of high school before she became an instructor at Augustana College in 1921–22. She studied at the University of Minnesota in 1922–24, then taught at Bethany College from 1925 to 1926. Larson received her Ph.D. from Columbia University and The Wheat Market and the Farmer in Minnesota, 1858–1900 in 1926. She then taught at Southern Illinois University in 1926–28 before she became a research associate at the Harvard University Graduate School of Business Administration in 1928. Together with N. S. B. Gras, she wrote Jay Cooke, Private Banker in 1936 and she was the editor of the Bulletin of the Business Historical Society in 1938. They compiled the Casebook in American Business History in 1939 and Larson was promoted to assistant professor that same year. She became the first woman to be appointed associate professor in the Graduate School of Business in 1942. Six years later, she wrote the Guide to Business History with Kenneth Wiggins Porter and she became associate editor of the Harvard Studies in Business History and then editor two years later. Larson was the senior author of the History of Humble Oil and Refining Company and History of Standard Oil Company (New Jersey), Vol. 3: New Horizons, 1927–1950, together with Evelyn H. Knowlton and Charles S. Popple. She was appointed professor of business history in 1960 and retired the following year. Larson died on 25 August 1983.
1