During Synaptic Transmission, the ________ Within the Axon Results in the Release

During synaptic transmission, the ________ within the axon results in the release of a(n) ________ that can traverse the synaptic gap.

A) myelin sheath; chemical message
B) electrical impulse; chemical message
C) electrical message; chemical message
D) myelin sheath; electrical impulse
E) ionic impulse; electrical impulse