Find the Exact Value of the Expression $\sin 195 ^ { \circ } \cos 75 ^ { \circ } - \cos 195 ^ { \circ } \sin 75 ^ { \circ }$

Multiple Choice

Find the exact value of the expression.
- $\sin 195 ^ { \circ } \cos 75 ^ { \circ } - \cos 195 ^ { \circ } \sin 75 ^ { \circ }$

A) $\frac { \sqrt { 3 } } { 2 }$

B) $- \frac { \sqrt { 3 } } { 2 }$

C) $- \frac { 13 } { 4 }$

D) $- \frac { 1 } { 2 }$