Nodes of Ranvier

A nerve impulse travels significantly faster along an axon wrapped in a myelin sheath compared to an unmyelinated axon of the same diameter. Which statement best analyzes the underlying mechanism for this increased speed?

Consider two neurons of equal length. Neuron X's axon is wrapped in a fatty sheath that is interrupted by small, regularly spaced gaps. Neuron Y's axon lacks this sheath entirely. If both neurons are stimulated at one end with sufficient intensity to generate an electrical signal, which statement best analyzes the resulting signal propagation?