Give the Amplitude or Period as Requested $y = - 2 \sin \frac { 1 } { 3 } x$

Multiple Choice

Give the amplitude or period as requested.
-Amplitude of $y = - 2 \sin \frac { 1 } { 3 } x$

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