Rewrite the Given Angle in Radian Measure as a Multiple $\pi$

Multiple Choice

Rewrite the given angle in radian measure as a multiple of $\pi$ . (Do not use a calculator.) $72 ^ { \circ }$

A) $\frac { 7 \pi } { 5 }$
B) $\pi$
C) $\frac { \pi } { 5 }$
D) $\frac { 2 \pi } { 5 }$
E) $\frac { 3 \pi } { 5 }$