electrical pulses produced by neurons travel along specialized extensions called:

Axon.

Explanation:

Neurons have three parts namely, a cell body(perikaryon), dendrites and axon.Axon is the thin tapering long process that conduct nerve impulses away from the cell body towards succeeding neurons or target organs.Axons are covered by a protective myelin sheath that provides insulation to nerve fibres. The myelin sheath are interrupted by small gaps called Nodes of Ranvier.The Nerve impulse travels from one node to another.

Ithink the answer is b
not sure