Let $f ( x ) = x ^ { 2 } \cos x$

Multiple Choice

Let $f ( x ) = x ^ { 2 } \cos x$ Then $f ^ { \prime } ( x )$ is

A) $x ( 2 \sin x + x \cos x )$
B) $x ( 2 \sin x - x \cos x )$
C) $x ( 2 \cos x + x \sin x )$
D) $x ( 2 \cos x - x \sin x )$
E) $x ( \sin x - 2 \cos x )$