Why did Iranian revolutionaries see the U

Why did Iranian revolutionaries see the U.S. as its enemy? (In other words, what was the context of the 1979 Revolution?) a. Because the Iranians had sided with the Soviet Union, which was anti-American. b. Because Iranians knew that the U.S. had funded the Shah's secret police, the SAVAK. c. Because the average person in Iran saw opposition to the U.S. as necessary to rid the world of pagans and non-Muslims. d. Because the U.S. support Shi'ites instead of Sunnies, and Sunnies made up the majority of Iranians.