Which of the following statement is wrong?

A. The difference between the maximum and minimum energies is called maximum fluctuation of energy

B. The coefficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed

C. The variations of energy above and below the mean resisting torque line is known as fluctuation of energy

D. None of the above

Please do not use chat terms. Example: avoid using "grt" instead of "great".