Simplify the Given Expression Algebraically $$\cos \left( \frac { \pi } { 2 } + x \right)$$

Multiple Choice

Simplify the given expression algebraically.
$$\cos \left( \frac { \pi } { 2 } + x \right)$$

A) $\sin x$
B) $- \sin x$
C) $\cos x$
D) $- \cos x$