Using Green's Theorem, the Line Integral $\int$ C $4 y d x + 3 x d y$

Multiple Choice

Using Green's Theorem, the line integral $\int$ C $4 y d x + 3 x d y$ where C is the quadrilateral with vertices at (0, 0) , (1, 0) , (1, 1) , and (0, 1) , is

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