Solution

$$\large\textbf{Correct Option: A}$$

$$\textbf{Solution}$$

Option A) $$\textbf{Presynaptic neuron}$$
$$\bullet$$ Synaptic vesicles (SVs) are small, electron-lucent vesicles that are clustered at presynaptic terminals which store neurotransmitters and release them by calcium-triggered exocytosis.
$$\bullet$$ Vesicles play an important role in propagating nerve impulses between neurons.
$$\bullet$$ The area in the axon that holds groups of vesicles is said to be the axon terminal.

Option B) $$\textbf{Postsynaptic neuron}$$
$$\bullet$$ Postsynaptic neuron has the receptors which receive the neurotransmitter.

Option C) $$\textbf{Synaptic cleft}$$
$$\bullet$$ Synaptic cleft is the empty area present between the two neurons.

Hence the correct answer is A) $$\textbf{Presynaptic neuron}$$