If $y_{_k}$ is the $k^{th}$ derivative of $y$ with respect to $'x'$ and $y = \cos (\sin x)$, then $y_{_1} \sin x+y_{_2} \cos x$ is equal to :

Question

( A ) $y \sin^3 x$
( B ) $y \cos^3 x$
( C ) $-y \sin^3 x$
( D ) $-y \cos^3 x$