Use the Fundamental Identities to Simplify the Expression $\sin 260 ^ { \circ } \cos 20 ^ { \circ } - \cos 260 ^ { \circ } \sin 20 ^ { \circ }$

Multiple Choice

Use the fundamental identities to simplify the expression.
- $\sin 260 ^ { \circ } \cos 20 ^ { \circ } - \cos 260 ^ { \circ } \sin 20 ^ { \circ }$

A) $- \frac { 13 } { 3 }$
B) $- \frac { \sqrt { 3 } } { 2 }$
C) $\frac { \sqrt { 3 } } { 2 }$
D) $- \frac { 1 } { 2 }$