What is the junction between the axon of one neuron and the dendrite of another neuron called?

Assertion : Transmission of nerve impulse across a synapse is accomplished by neurotransmitters.
Reason : Transmission across a synapse usually requires neurotransmitters because there is a small space,i.e.,synaptic cleft,that separates one neuron from another.

The chemical causing the transmission of nerve impulse across synapses is

Distinguish between:
$(1)$ Synapse and Neurotransmitters.
$(2)$ Myelinated nerve fiber and Non-myelinated nerve fiber.

At the neuromuscular junction,

$A$ diagram showing an axon terminal and a synapse is given. Identify correctly at least two of $A - D$.