A body executes simple harmonic motion. The potential energy (P.E), the kinetic energy (K.E) and energy (T.E) are measured as a function of displacement `x`. Which of the following staements is true?
A. `TE` is zero at `x =0`
B. `PE` is maximum at `x = 0`
C. `KE` is maximum at `x =0`
D. `KE` is maximum when `x` is maximum