Which One of the Following Is True with Respect to Presidential

Which one of the following is true with respect to presidential conduct of foreign policy?

A) Presidents rely exclusively on their secretaries of state to help conduct foreign policy.
B) Modern presidents increasingly have become involved in conducting foreign policy by negotiating with the heads of foreign governments.
C) The vice president and the secretary of defense are the president's primary links with the State Department.
D) Presidential foreign policy deals only with military conflicts and sending American troops into war zones.
E) Presidents are rarely called upon to make important foreign policy decisions; most of those decisions are made by Congress.