A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-C. A- Receptor, C- Synaptic vesicles; B- Synaptic connection, C-K+; A- Neurotransmitter, B- Synaptic cleft; C- Neurotransmitter, B-Ca++; A- Receptor, C- Synaptic vesicles

The synaptic vesicles (represented by C) are present inside the axon terminals and they contain the neurotransmitters. They get attached to the pre-synaptic membrane and release the neurotransmitter in the synaptic cleft (represented by B) which gets attached to the receptor (represented by A) present on post-synaptic membrane. Thus, the correct solution is option A.