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: What is the current enrollment of the school where Ingold completed his PhD in 1951. Passage 1:He was born to Sir Christopher Ingold and Dr. Hilda Usherwood, and studied for a BSc in Chemistry at the University of London, completing his degree in 1949. He continued his higher education with a PhD in chemistry at Oxford University, which he completed in 1951. Soon after graduation he moved to Canada to begin work with the National Research Council, followed by two years of post-doctoral research at the University of British Columbia. He returned to work for the NRC in 1955 as a research officer, followed by a promotion to head of the Free Radical Chemistry Section. He was awarded the 1968 Petroleum Chemistry Award, the 1988 Linus Pauling Award, and both the Davy Medal and Royal Medal of the Royal Society, the latter for "elucidating the mechanism of reactions involving free radicals". In 1995 he was made an officer of the Order of Canada. He has received honorary degrees from the universities of Guelph, Mount Allison, St Andrews, Carleton, McMaster and Dalhousie.
Passage 2:In 1938, after graduating from the Spetses school, Xenakis moved to Athens to prepare for entrance exams at the National Technical University of Athens. Although he intended to study architecture and engineering, he also took lessons in harmony and counterpoint with Aristotelis Koundouroff. In 1940 he successfully passed the exams, but his studies were cut short by the Greco-Italian War, which began with the Italian invasion on 28 October 1940. Although Greece eventually won the war, it was not long before the German army joined the Italians in the Battle of Greece, in April 1941. This led to the Axis occupation of Greece during World War II, which lasted until late 1944, when the Allies began their drive across Europe, forcing the Axis forces to withdraw. Xenakis joined the National Liberation Front early during the war, participating in mass protests and demonstrations, and later becoming part of armed resistancethis last step was a painful experience Xenakis refused to discuss until much later in life. After the Axis forces left, Churchill ordered that British forces step in to help restore the Greek monarchy; they were opposed by the Democratic Army of Greece, and the country plunged into a civil war. In December 1944, during the period of Churchill's martial law, Xenakis (who was by then a member of the communist students' company of the left-wing Lord Byron faction of ELAS) became involved in street fighting against British tanks. He was wounded and facially disfigured when shrapnel from a tank blast hit his cheek and left eye, which was blinded; that Xenakis survived the injury has been described as a miracle.
Passage 3:After college, Cranston began his acting career in local and regional theaters, getting his start at the Granada Theater in the San Fernando Valley. He had previously performed as a youth, but his show business parents had mixed feelings about their son being involved in the profession, so he did not continue until years later. Cranston was ordained as a minister by the Universal Life Church, and performed weddings for $150 a service to help with his income. He also worked as a waiter, night-shift security guard at the gates of a private LA community, truck loader, camera operator for a video dating service, and CCTV security guard at a supermarket. He started working regularly in the late 1980s, mostly doing minor roles and advertisements. He was an original cast member of the ABC soap opera Loving, where he played Douglas Donovan from 1983 to 1985. Cranston starred in the short-lived series Raising Miranda in 1988. Cranston's voice acting includes English dubbing of Japanese anime (for which he primarily used the non-union pseudonym Lee Stone), including Macross Plus and Armitage III: Poly-Matrix, and most notably, as Fei-Long, and the children's series Mighty Morphin Power Rangers. Cranston did voice work for the 1993-94 first season of that series, playing characters such as Twin Man and Snizzard, for which he was paid about $50 an hour for two or three hours of daily work. The Blue Power Ranger, Billy Cranston, was named for him.

A:
1