Answer:
The correct option is (c) K+ efflux
Step-by-step explanation:
In neuroscience, after the depolarization phase of the action potential has changed the potential of the membrane to a positive value, the membrane potential returns back it to its negative value. This change or return of the membrane potential back to its negative value after the depolarization phase is known as Repolarization
Repolarization occurs when the positively charged K+ ions move out of the cell.
Therefore, the efflux of K⁺ ions represents repolarization.