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

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.

Question -2-

According to Article II, Section 2, of the Constitution, treaties negotiated by the president must be
 
  a. ratified by a simple majority of the Senate.
  b. ratified by a simple majority of the House.
  c. ratified by a two-thirds majority of the Senate.
  d. ratified by a two-thirds majority of the House.
  e. ratified by majorities of both the House and Senate.

Question -3-

Turning over control of the Panama Canal to Panama was accomplished through a(n)
 
  a. treaty.
  b. executive agreement.
  c. joint resolution of Congress.
  d. multinational corporation.
  e. judicial review.