Find the Specified Quantity $y = 4 \sin \left( 2 x + \frac { \pi } { 4 } \right)$

Multiple Choice

Find the specified quantity.
-Find the amplitude of $y = 4 \sin \left( 2 x + \frac { \pi } { 4 } \right)$ .

A) 4
B) $\frac { \pi } { 4 }$
C) 8
D) 2