Two test charges are brought separately into the vicinity of a charge +Q. First the test charge +q is brought to a point A that is a distance r from +Q. Then, the +q charge is removed and a different test charge +2q is brought to a point B that is a distance of 2r from +Q. Compared with the electric potential, V, experienced by the charge at A, that experienced by the charge at B is: a. Twice as large as before. b. Four times as large as before. c. Half as large as before. d. One quarter as large as before. e. Unchanged