A Pendulum Does Not Have Simple Harmonic Motion If Its $\theta$

A pendulum does not have simple harmonic motion if its angular amplitude $\theta$ ₀ is not small.For large angular amplitudes,the period is given by T = T₀[1 + (1/4) sin² $\theta$ ₀ + (3/64) sin⁴ $\theta$ ₀ + · · · ]
As the angular amplitude of the pendulum gets larger,the frequency of the pendulum

A) does not change.
B) increases.
C) decreases.
D) does whatever the period does.
E) changes in proportion to T₀.