Particles 1, with Charge Q₁ and 2, with a Charge

Multiple Choice

Particles 1, with charge q₁ and 2, with a charge q₂ are on the x axis, with particle 1 at x = a with and particle 2 at x = -2a. For the net force on a third charged particle, at the origin to be zero q₁ and q₂ must be related by q₂=:

A) 2q₁
B) 4q₁
C) -2q₁
D) -4q₁
E) -q₁/4