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

Multiple Choice

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

A) $4 \pi$
B) $\frac { \pi } { 2 }$
C) $2 \pi$
D) $5 \pi$