Four Charged Particles (Two Having a Charge +Q and Two

Multiple Choice

Four charged particles (two having a charge +Q and two having a charge -Q) are distributed as shown below.Each charge is equidistant from the origin.In which direction is the net electric field at the point P,which is on the y axis?

A) directly up (in the positive y direction)
B) directly left (negative x direction)
C) upwards,toward the left
D) upwards,toward the right
E) The net field is zero,so there is no direction.