Solve the Problem $\theta ( 0 \leq \theta < 2 \pi )$

Solve the problem.
-For what values of $\theta ( 0 \leq \theta < 2 \pi )$ do maximum $r$ -values occur on the graph of the polar equation $r = 2 \sin 4 \theta$ ? Note that a maximum $r$ -value occurs at a point that is the maximum distance from the pole.

A) $\frac { \pi } { 8 } , \frac { 5 \pi } { 8 } , \frac { 9 \pi } { 8 } , \frac { 13 \pi } { 8 }$
B) $0 , \frac { \pi } { 2 } , \pi , \frac { 3 \pi } { 2 }$
C) $\frac { \pi } { 8 } , \frac { 3 \pi } { 8 } , \frac { 5 \pi } { 8 } , \frac { 7 \pi } { 8 } , \frac { 9 \pi } { 8 } , \frac { 11 \pi } { 8 } , \frac { 13 \pi } { 8 } , \frac { 15 \pi } { 8 }$
D) $0 , \frac { \pi } { 4 } , \frac { \pi } { 2 } , \frac { 3 \pi } { 4 } , \pi , \frac { 5 \pi } { 4 } , \frac { 3 \pi } { 2 } , \frac { 7 \pi } { 4 }$