Answer:
C. The federal courts
Explanation:
Judicial Branch - The Supreme Court. The Judicial Branch of the government is made up of judges and courts. Federal judges are not elected by the people. They are appointed by the president and then confirmed by the Senate.
C.) Truman, Eisenhower, Kennedy, Johnson
Well besides the fact that if one didnt do its job, none of them could, they all needed the things that the others made or would do.