Point Charges: Which vector could represent the force on Z?

Question

Three identical metal spheres, x, y, and z, are placed at the corners of an equilateral triangle, as shown below. Sphere z has a constant positive charge. Which vector could represent the force on z, when y is positive and x is negative, with the magnitude of the charge on y less than that on x?

http://i36.photobucket.com/albums/e12/lilbac2003/ThreeChargedMetalSpheres.gif

Answer 1

i think it would be A because z would be attracted to the negative sphere y because the magnitude of the charge on x is less than that on y.