The Line Integral $\int$ C $( x y + 1 ) d s$

Multiple Choice

The line integral $\int$ C $( x y + 1 ) d s$ where C is the curve $x = \sin t , y = \cos t , 0 \leq t \leq \pi ,$ is

A) $3 \pi$
B) $2 \pi$
C) $\pi$
D) $\frac { \pi } { 2 }$
E) $\frac { \pi } { 3 }$