Convert the Degree Measure to Radians $- 60 ^ { \circ }$

Multiple Choice

Convert the degree measure to radians. Leave answer as a multiple of π.
- $- 60 ^ { \circ }$

A) $- \frac { \pi } { 4 }$
B) $- \frac { \pi } { 2 }$
C) $- \frac { \pi } { 5 }$
D) $- \frac { \pi } { 3 }$