Evaluate the Line Integral $\int \sin x \sin y d x - \cos x \cos y d y \text { using the Fundamental }$

Multiple Choice

Evaluate the line integral $\int \sin x \sin y d x - \cos x \cos y d y \text { using the Fundamental }$ Theorem of Line Integrals, where $C$ is the line segment from $( 0 , - \pi )$ to $\left( \frac { 3 \pi } { 2 } , \frac { \pi } { 2 } \right)$ .

A) $- 2$
B) $- 1$
C) 2
D) 1
E) 0