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.
- $\cot 120 ^ { \circ }$

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