Three Charges (-Q, +Q, and Q) Are Placed at the Vertices

Multiple Choice

Three charges (-q, +q, and Q) are placed at the vertices of an equilateral triangle. The force on Q due to the charges -q and +q

A) points in the positive x direction.
B) points in the positive y direction.
C) is zero.
D) points in the negative x direction.
E) points in the negative y direction.