Express the Sum or Difference as a Product of Sines $\sin ( 2 \theta ) - \sin ( 4 \theta )$

Multiple Choice

Express the sum or difference as a product of sines and/or cosines.
- $\sin ( 2 \theta ) - \sin ( 4 \theta )$

A) $2 \cos ( 2 \theta ) \cos ( 3 \theta )$
B) $- 2 \sin \theta$
C) $- 2 \sin \theta \cos ( 3 \theta )$
D) $2 \sin ( 3 \theta ) \cos \theta$