Let $f ( x ) = \sin \left( e ^ { x } \right)$

Multiple Choice

Let $f ( x ) = \sin \left( e ^ { x } \right)$ Then $f ^ { \prime } ( x )$ is

A) $\cos \left( e ^ { x } \right)$
B) $e ^ { x } \cos \left( e ^ { x } \right)$
C) $- e ^ { x } \cos \left( e ^ { x } \right)$
D) $e ^ { x } \sin \left( e ^ { x } \right)$
E) $- e ^ { x } \sin \left( e ^ { x } \right)$