Which of the Following Statements About Riding Position Is True

Which of the following statements about riding position is true?

A) In seated climbing, riders may want to sit slightly further back on the saddle to increase power.
B) Moving the saddle back to stretch out the upper body mimics a racing position.
C) Pedaling in a standing position with the hips behind the saddle mimics a mountain bike position.
D) None of the above; riders should sit in the center of the saddle at all times.