Using Green's Theorem, the Line Integral $\int$ C $e ^ { x + y } d x + e ^ { x + y } d y$

Multiple Choice

Using Green's Theorem, the line integral $\int$ C $e ^ { x + y } d x + e ^ { x + y } d y$ where C is $x ^ { 2 } + y ^ { 2 } = 4$ is

A) 3
B) 2
C) 1
D) 0
E) -1