Correct Answer - C
All perriodic motion is not simple harmonic motion but all simple harmonic motion is periodic. Hence, option (a) is an incorrect statement. In SHM, the period is independent on the amplitude of oscillation. Hence, option 9b) is an incorrect statement.
In SHM, the phase constant is determined by the initial conditions.
Hence, option (c) is a correct statement.
the resonance frequency of a ddriven oscillator does not depend on the damping.
hence, option (d) is an incorrect statement.