Final answer:
During repolarization, the Na+/K+ pump restores the ionic conditions of the cell by maintaining the sodium and potassium ion gradient across the cell membrane.
Step-by-step explanation:
During repolarization, the initial events such as the closing of voltage-gated sodium channels and the opening of potassium channels restore the electrical conditions to the resting state. The Na+/K+ pump, which is powered by ATP, is then necessary to restore the ionic conditions of the cell by actively transporting Na+ out of the cell and K+ into the cell, maintaining the resting membrane potential. The correct answer to the question is therefore c. ionic conditions.