Which of the Following Is a Reason the President's Party

Which of the following is a reason the president's party can be an unreliable presidential ally?

A) The president's party may become less supportive if the president's job approval ratings decline.
B) The opposition party is equally capable of lobbying the president's party in Congress by helping with fund-raising and publicity.
C) Members of Congress generally believe that their electoral prospects are unrelated to presidential success or popularity.
D) Congressional leaders often try to sabotage their own party's presidents so they can defeat them in the next presidential primary contest.
E) Members of Congress are promoted to committee leadership based on their independence,so they have career incentives to pick fights with the president.