Evaluate Without Using a Calculator by Using Ratios in a Reference

Multiple Choice

Evaluate without using a calculator by using ratios in a reference triangle.
- $\sin \frac { 5 \pi } { 3 }$

A) $\frac { 1 } { 2 }$
B) $- \frac { \sqrt { 2 } } { 2 }$
C) $- \frac { \sqrt { 3 } } { 2 }$
D) $\frac { \sqrt { 3 } } { 2 }$