Answer:
A. Expulsion of K+ by the sodium potassium pumps.
Explanation:
Resting membrane potential requires potassium ions to be inside the cell, so expulsion would lead to loss of resting membrane potential or git would generate action potential.
Unequal distribution of ions would benefit the resting membrane potential as it is around -70 mV.
The inability of anions to leave the cell would lead to polarization and consequently to resting membrane potential.
Expulsion of sodium ions by sodium potassium pump also leads to resting membrane potential.
