The correct option is B Electrical synapses are abundant in our system.
There are two types of synapses, namely, electrical synapses and chemical synapses. Electrical synapses are rare in our system. In electrical synapses, the synaptic cleft is narrow only 0.2 nm. Whereas the synaptic cleft between the chemical synapse is wide and hence impulse transmission through an electrical synapse is faster than chemical synapses.