Without Graphing the Function, Determine Its Amplitude or Period as Requested

Multiple Choice

Without graphing the function, determine its amplitude or period as requested.
- $y = - 4 \sin 5 x \quad$ Find the amplitude.

A) $\frac { \pi } { 4 }$
B) $\frac { \pi } { 3 }$
C) $\frac { 4 } { 3 }$
D) 4