Pumping Protons (H⁺) Out of a Cell Can Trigger the Movement

Pumping protons (H⁺) out of a cell can trigger the movement of

A) K⁺ out of the cell and Cl^- into the cell.
B) K⁺ into the cell and Cl^- out of the cell.
C) both K⁺ and Cl^- out of the cell.
D) both K⁺ and Cl^- into the cell.
E) K⁺ into the cell, with no movement of Cl^-.