Answer: The answers are (A) A rescue operation failed and led to the deaths of eight US military personnel, (C) It happened because the United States supported the overthrown Shah of Iran, (D) It was backed by the Islamist Ayatollah Khomeini.
Explanation: Fifty-two American diplomats and citizens were held hostage for 444 days from November 4, 1979, to January 20, 1981, after a group of Iranian college students belonging to the Muslim Student Followers of the Imam's Line, who supported the Iranian Revolution, took over the U.S. Embassy in Tehran.
Result: Hostages released by Algiers Accords
Location: Tehran, Iran
Date: November 4, 1979 – January 20, 1981;