Answer
C.
Work Step by Step
Vectors F1 and F2 are of the same magnitude but would result in a net force pointing up and to the right.
A) results in a Net force to the left but also up.
B) results in a Net Force to the left and up as well.
C) results in a net force to the left. The "y" component of this vector is equal to the "y" component of F1 and the "x" component is greater than the x component of F2 resulting in a net force to the left.
D) results in a net force down and to the left.