Give the Amplitude or Period as Requested $y = - 2 \sin 3 x$

Multiple Choice

Give the amplitude or period as requested.
-Amplitude of $y = - 2 \sin 3 x$

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