Answer:
A.
Step-by-step explanation:
The Iran Hostage Crisis was a diplomatic standoff between the Iranian students and United States. On November 4, 1979 the militarized Iranian students. From November 4, 1979 to January 20, 1979 for 444 days, 52 diplomats and citizens were held hostage by Iranian students.
The hostage crisis began against the US support to Iranian ruler, Mohammad Reza Pahlavi, who was overthrown by citizens in 1979. The United States was supporting the Shah of Iran and took him for his cancer treatment.
Therefore, option A is correct.