Which statement is true?

a. eisenhower chose robert taft as his running mate, because taft had been president before.
b. eisenhower chose nixon as his running mate, because nixon was strongly anti-communist.
c. eisenhower chose nixon as his running mate, because nixon had almost as many votes at the convention as he had.
d. eisenhower chose robert taft as his running mate, because taft agreed with his policies.