The Iran-Contra affair:

a. refers to the U. S. efforts to overthrow the shah.
b. resulted in the seizure of a secret Iranian oil reserve owned by Oliver North.
c. was quickly discovered by Congress soon after it began.
d. was a scandal that brought down Reagan’s cabinet, as well as high-ranking officials in the Marine Corps.
e. was the greatest scandal of the Reagan administration.

The Iran-Contra Affair refers to the U.S efforts to overthrow the Shah.  So the answer would be "A".

Explanation:

The Iran-Contra Affair was a secret U.S. arms deal that traded missiles and other arms to free some Americans held hostage by terrorists in Lebanon, but also used funds from the arms deal to support armed conflict in Nicaragua.

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