The correct answer is Option A A – Receptor, C – Synaptic vesicles

This is because –

When an impulse reaches the axon terminal, it causes synaptic vesicles to migrate towards the membrane, where they fuse with the plasma membrane and release their contents.

Neurotransmitters bind to their unique receptors on the post-synaptic membrane in the synaptic cleft.

As a result, A – Receptor and C – Synaptic Vesicles are used.