Determine the Amplitude or Period as Requested $y = 5 \sin \left( 7 x - \frac { \pi } { 2 } \right)$

Multiple Choice

Determine the amplitude or period as requested.
-Period of $y = 5 \sin \left( 7 x - \frac { \pi } { 2 } \right)$

A) $\frac { 2 \pi } { 7 }$
B) $\frac { 7 \pi } { 2 }$
C) $\frac { 2 } { 7 }$
D) $\frac { 7 } { 2 }$