Show That the Equation Is Not an Identity by Finding $\sin ( x + \pi ) = \sin x$

Multiple Choice

Show that the equation is not an identity by finding a value of x for which both sides are defined but not equal.
- $\sin ( x + \pi ) = \sin x$

A) $\frac { \pi } { 2 }$
B) 0
C) $2 \pi$
D) $\pi$