Two Charges Lie on the X Axis, +3q at the Origin

Multiple Choice

Two charges lie on the x axis, +3q at the origin, and −2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is

A) 1.0 m.
B) 2.0 m.
C) 2.5 m.
D) 3.0 m.
E) 4.0 m.