For a Swinging Pendulum, the Maximum Angle That the Pendulum's $\phi=A \cos (\omega t+\theta)$

Multiple Choice

For a swinging pendulum, the maximum angle that the pendulum's string makes with the vertical corresponds to what in the pendulum solution $\phi=A \cos (\omega t+\theta)$ ?

A) $A$
B) $\phi$
C) $\theta$
D) Something else (specify)