In 1979, iranian militant groups took hostage in tehran.
a. 52 americans
b. american students
c. ayatollah khomeini
d shah mohamad reza pahlavi

   A. 52 Americans.

Explanation:

  Known as the Iran hostage crisis, it was a diplomatic standoff that lasts 444 days. A group of Iranian college students supporters of the Revolution held in that country took the U.S. embassy in Tehran. It is up to to this day the longest hostage crisis.

  They did this in response to what they saw as American complicity with the former Shah of Iran Reza Pahlavi who was accused of committed crimes to Iranian civilians. The U.S. admitted him for cancer treatment and gave him asylum. But Iran demanded his return to stand for trial. With the negativity of the U.S. the Revolution decided to took the embassy with 52 American diplomats and citizens inside.

  I hope this answer helps you.

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explanation: