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(C) During the action potential,the depolarization phase is caused by the rapid influx of $Na^+$ ions into the neuron.Following this,the repolarizatio

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$K^+$ efflux

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(C) During the action potential,the depolarization phase is caused by the rapid influx of $Na^+$ ions into the neuron.Following this,the repolarization phase occurs to restore the resting membrane potential.Repolarization is primarily caused by the closure of voltage-gated $Na^+$ channels and the opening of voltage-gated $K^+$ channels.As a result,$K^+$ ions move out of the neuron (efflux),which makes the inside of the membrane negative again relative to the outside.

Repolarization of a nerve fiber is caused by which of the following?

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