Which of the following uses the ligand gated ion channels.

A. Photons of light activating an ion channel with photoreceptors of the retina.

B. Hair cells in the cochlea vibrate in response to sound to activate an ion channel.

C. In the spike initiation zone, or axon hillock, the membrane potential becomes sufficiently depolarized to activate an action potential.

D. GABA is released from vesicles of the presynaptic terminal causing an increase in chloride ions on the post synaptic membrane.