The Diagram Shows a Particle with Positive Charge Q and a Particle

Multiple Choice

The diagram shows a particle with positive charge Q and a particle with negative charge-Q. The electric field at point P on the perpendicular bisector of the line joining them is:

A) $\uparrow$
B) $\downarrow$
C) $\rightarrow$
D) $\leftarrow$
E) zero