The correct answer is B. Iran-contra affair.
Lt. Colonel Oliver North implicated Iran-contra affair scandal.
He was a television host, military historian, American political commentator, retired U.S marine corps, Lieutenant Colonel and an author.
In the late 1980s he was convicted in the affair of Iran-contra whereby his convictions were being reversed and vacated in the year 1991 and dismissal of charges which were against him.
It is during his Iran-contra affair that Oliver and in his term when he acted as a national security council.
