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Simple Harmonic Motion - Multiple Choice Questions

Q2. A particle oscillates with undamped simple harmonic motion. Which one of the following statements about the acceleration of the oscillating particle is true?

A It is least when the speed is greatest. Speed is greatest when x = zero (therough the centre of the swing). If x = zero acceleration = zero, so this is true.
B It is always in the opposite direction to its velocity. It is always in the opposite direction to displacement.
C It is proportional to the frequency. It is proportional to frequency squared.
D It decreases as the potential energy increases. That would mean it decreased as x went from zero to A. It is at a maximum when x = A and zero when x = zero, so this is not true.