Votes of Confidence in the American Senate Can NOT Override

Votes of confidence in the American Senate can NOT override a presidential veto.Why is this true statement?

A) because the President acts only on the advice and consent of the Senate
B) because nothing can override a presidential veto
C) because a vote of confidence occurs when both houses pass a bill, after it has been rejected, by a simple majority
D) because votes of confidence do not exist in the American presidential system