Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Complete the identity.
- $\sin ( 4 \theta ) \sin ( 7 \theta ) \cos ( 4 \theta ) \cos ( 7 \theta ) = ?$

A) $\cos ^ { 2 } ( 56 \theta )$
B) $\frac { \sin ^ { 2 } ( 56 \theta ) } { 4 }$
C) $\frac { \cos ^ { 2 } ( 11 \theta ) + \cos ^ { 2 } ( 3 \theta ) } { 4 }$
D) $\frac { \cos ^ { 2 } ( 3 \theta ) - \cos ^ { 2 } ( 11 \theta ) } { 4 }$