Find the Specified Quantity $y = - 5 \sin \left( \frac { 1 } { 3 } x - \frac { \pi } { 2 } \right)$

Multiple Choice

Find the specified quantity.
-Find the period of $y = - 5 \sin \left( \frac { 1 } { 3 } x - \frac { \pi } { 2 } \right)$ .

A) $5 \pi$
B) $6 \pi$
C) $\frac { \pi } { 2 }$
D) $3 \pi$