Which Statement Concerning Regulation of the Citric Acid Cycle Is

Which statement concerning regulation of the citric acid cycle is TRUE?

A) High levels of ATP inhibit the reactions of the cycle.
B) High levels of NADH inhibit the reactions of the cycle
C) Low levels of ATP stimulate the reactions of the cycle.
D) High levels of ADP stimulate the reactions of the cycle.
E) All of the statements are true.