Question

what is a nerve?
a bundle of axons
a support cell of the nervous system
a mass of cell bodies
the axon of a single neuron

Explanation:

In the nervous - system, a nerve is defined as a bundle of axons. Support cells are glial cells. A mass of cell bodies is a ganglion. And a nerve is not just the axon of a single neuron.

Answer:

A. A bundle of axons