PLEASE HELP ME Why did the U. S. CIA help return the Shah (king) of Iran to power, replacing the elected government of Iran?

a
Because supporters of the Shah took U. S. students hostage.
b
Because the U. S. wanted to install a pro U. S. government and protect oil access in the region.
c
Because the Ayatollah was forced to flee by the Shah.
d
Because the Shah's government brutalized the people.

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