A Charge +Q₁ Is Brought to a Point a Distance

Multiple Choice

A charge +q₁ is brought to a point a distance r from a charge +q. Then +q₁ is removed and a charge -q₁ is brought to the same point. If in the first case the electrostatic potential at r is V, the electrostatic potential at the same point in the second case is

A) -2V.
B) -V.
C) 0.
D) V.
E) 2V.