Use the Sum-To-Product Formulas to Write the Given Expression as a Product

Multiple Choice

Use the sum-to-product formulas to write the given expression as a product.
$\sin 5 \theta - \sin 3 \theta$

A) 2 sin 4 $\theta$ cos $\theta$
B) -2 sin 4 $\theta$ sin $\theta$
C) - 2 cos 4 $\theta$ cos $\theta$
D) 2 cos 4 $\theta$ sin $\theta$
E) 2 cos 4 $\theta$ cos $\theta$