Which of the Following Statements Regarding Exercise Is True

Which of the following statements regarding exercise is true?

A) The main source of energy during aerobic exercise is ATP from aerobic respiration.
B) For an activity such as jogging or long-distance running, the primary source of energy is stored ATP and PCr.
C) During a short burst of activity such as a sprint, the main source of energy is aerobic respiration.
D) If the demand for ATP outstrips oxygen supply, muscles switch to aerobic fermentation.