The Driving Force on an Ion Is Defined as the Difference

The driving force on an ion is defined as the difference between the

A) membrane potential and the threshold potential.
B) conductance of an ion and the membrane potential.
C) membrane potential and the equilibrium potential for that ion.
D) fraction of ions on the intracellular and extracellular membranes.
E) sodium and potassium equilibrium potentials.