What Governs the Movement of Ions Through Channels in the Plasma

What governs the movement of ions through channels in the plasma membrane?

A) Ions move through such channels passively, driven by concentration gradients and by the electrical potential across the membrane.
B) Ions move through channels actively, driven by the energy provided by ATP.
C) Ions move through channels passively, driven only by the concentration gradient.
D) Ions move through channels passively, driven only by the electrical potential across the membrane.
E) Ions move through channels actively, driven by the energy provided by GTP.