In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: In what year was CIA pilot Francis Gary Powers born? Passage:Strategic Air Command was formed by the United States Air Force after World War II to provide an active defense against any surprise attack by the Soviet Union. Though it had been an ally against Germany and Japan during World War II, by 1948 the Soviet Union showed a propensity to instigate problems with Britain, France and the United States. In August 1949, the Soviet Union detonated its first nuclear weapon and by the early 1950s had detonated a hydrogen bomb. The war of words between the two superpowers escalated during 1950s and 1960s into a nuclear arms race. By 1970 the United States was using a "Triad Defense System" composed of nuclear submarines armed with nuclear missiles, land based intercontinental ballistic missiles with nuclear warheads and bombers capable of delivering hydrogen bombs on enemy targets. The Boeing B-52 Stratofortress bomber had been designed in the early 1950s by Boeing Aircraft Company to give the United States Air Force the capability of delivering nuclear weapons far inside the territory of Soviet Russia. The planes were to fly at high altitude with enough fuel to hit their target. In May 1960, the Soviet Union made known its capability to shoot such high altitude planes out of the sky by using a surface to air missile to strike CIA pilot Francis Gary Powers' U-2 spy plane over Russian territory. From that point on, the high-altitude B-52 had to be modified to conduct missions at low level, something it was not intended to be.
Links: a. Strategic Air Command b. Intercontinental ballistic missile c. Intercontinental ballistic missile d. Francis Gary Powers
d

Question: Who other than Woldenga has been awarded the Knights cross of the Iron Cross? Passage:Woldenga's career started as a captain in the merchant marine. He started his flight training in 1928 and worked as chief pilot for the FVK Warnemunde. He transferred to the newly emerging Luftwaffe, taking command as Gruppenkommandeur of the I./Jagdgeschwader 131 (JG 131) later renamed to I./Jagdgeschwader 1 (JG 1) on 1 April 1937. With this unit he participated in the invasion of Poland in 1939. He surrender command of the Gruppe on 1 February 1940 and was transferred to the Reichsluftfahrtministerium. He briefly led Jagdgeschwader 27 (JG 27) on the Channel Front from 11 October to 22 October 1940 before he was made Geschwaderkommodore of Jagdgeschwader 77 (JG 77). Under this command, JG 77 participated in the Balkans Campaign and invasion of Crete. JG 77 claimed 50 aerial victories. Woldenga received the Knight's Cross of the Iron Cross. He commanded of JG 27 on 21 June 1941 during the invasion of the Soviet Union and claimed 4 aerial victories. He relocated the Geschwaderstab to North Africa in December 1941. He was appointed Fliegerfuhrer Balkan on 10 June 1942. His last service position of the war was commander of the Luftkriegschule 10 in Furstenwalde near Berlin. He is credited with three aerial victories of which two were claimed on the Eastern Front.
Links: a. Knight's Cross of the Iron Cross b. Furstenwalde c. Furstenwalde d. Jagdgeschwader 77
a

Question: How many years had Ernest Lawrence worked at UCLA before Backus attended? Passage:John Backus was born and raised in Portland, Oregon, where he studied at Reed College, receiving a BA in 1932. He went on to graduate studies at the University of California, Berkeley, where he did research in nuclear physics at the Radiation Laboratory under Ernest Lawrence. He received an MA in 1936, and a PhD in 1940. In 1945 he was appointed Professor of Physics at the University of Southern California, a post he retained until his retirement in 1980. During the early part of his career, his research focussed on gaseous discharges in strong magnetic fields. He was also a musician, trained as a performer on piano, bassoon, clarinet and other woodwinds and received the degree of MMus in conducting from the University of Southern California in 1959. In his later career he turned increasingly to the study of musical acoustics, particularly those of wind instruments and organ pipes. In 1969 he published The Acoustical Foundations of Music, a book which became a standard text for introductory courses in musical acoustics. A second edition appeared in 1977. He received the Silver Medal of the Acoustical Society of America in 1986. Backus died in Los Angeles in 1988.
Links: a. Woodwind instrument b. Los Angeles c. Ernest Lawrence d. Musical acoustics
c