The correct answer is B) Presidents need to provide a check on the executive agencies of the bureaucracy.
The Iran-Contra affair of the mid-1980s illustrates about presidents and foreign policy is that Presidents need to provide a check on the executive agencies of the bureaucracy.
The Iran-Contras Affair or "Irangate", was the scandal of the second Reagan administration involving sales of arms to Iran in partial exchange for the release of hostages in Lebanon and use of the arms money to aid the Contras in Nicaragua.
This affair involved secretly sell weapons to Lebanon to free American hostages in that place, but the money was also used to support the Contras in Nicaragua, in Central America. The scandal heavily affected the presidency of Ronald Reage, becoming a mediatic issue because Reagan secretly instructed Robert McFarland, National Security Advisor, to keep on sending weapons to the Nicaragua Contras.