For the Simple Harmonic Motion Described by the Trigonometric Function,find $d = \frac { 1 } { 4 } \sin 6 \pi t$

Multiple Choice

For the simple harmonic motion described by the trigonometric function,find the frequency per second.? $d = \frac { 1 } { 4 } \sin 6 \pi t$ ?

A) $3$
B) $6$
C) $3 \pi$
D) $6 \pi$
E) $2 \pi$