Simplify the Expression Algebraically $3 \cos ( \pi - \theta ) + 3 \sin \left( \frac { \pi } { 2 } + \theta \right)$

Multiple Choice

Simplify the expression algebraically.
$3 \cos ( \pi - \theta ) + 3 \sin \left( \frac { \pi } { 2 } + \theta \right)$

A) $3 \cos ( \theta ) - 3 \sin ( \theta )$
B) 0
C) $3 \cos ( \theta ) + 3 \sin ( \theta )$
D) 1
E) 6