I think it is A or either B
Answer:
B - Protons and Neutrons
Explanation:
This is because the electrons are in the electron cloud.
The synapse is the junction present between two neurons.
In a synapse, the electric impulses are transferred in the form of chemical molecule, which is also known as neurotransmitter. The synapse receives the signals from the sender neuron also known as presynaptic neuron to the receiver neuron, also called as postsynaptic neuron.
Hence, the correct answer is option c. junction between a sending neuron and a receiving neuron.