Use Stokes' Theorem to Calculate the Circulation of the Field

Multiple Choice

Use Stokes' Theorem to calculate the circulation of the field F around the curve C in the indicated direction.
-F = i + xyj + yk; C: the counterclockwise path around the perimeter of the rectangle in the x-y plane formed from the x-axis, y-axis , x = 2 and y = 8

A) 128
B) 64
C) - 64
D) -128