The best and most correct answer among the choices provided by your question is the first choice or letter A which is "Iran hostage crisis."
The Iran hostage crisis was a diplomatic crisis between Iran and theUnited States. 52 American diplomats and citizens were held hostage for 444 days (November 4, 1979, to January 20, 1981) after a group of Iranian 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.
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