Answer :
The overthrow of the Shah by Islamist activists is the event launched the Islamic Revolution in Iran. Hence, option A is correct.
What caused Iran Islamic revolution?
The contributing factors behind it are still a matter of historical contention, but it is thought that they may have been influenced by conservative backlash against the Westernization, Modernization, and Secularization efforts of the Western-backed Shah as well as by a more general response to social injustice.
Iranian Revolution, also known as the Islamic Revolution or Enqelb-e Eslam in Persian, was a popular revolt in Iran that took place in 1978–1979 and resulted in the overthrow of the Shah on February 11 and the founding of an Islamic republic.
Thus, option A is correct.
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