Express as a Product $\sin 13 \theta + \sin 3 \theta$

Multiple Choice

Express as a product. $\sin 13 \theta + \sin 3 \theta$

A) $\sin ( 8 \theta ) \cos ( 5 \theta )$
B) $2 \sin ( 16 \theta ) \cos ( 10 \theta )$
C) $2 \cos ( 9 \theta ) \sin ( 4 \theta )$
D) $4 \sin ( 8 \theta ) \cos ( 5 \theta )$
E) $2 \sin ( 8 \theta ) \cos ( 5 \theta )$