The answer is C. cell body.
Neuron consists of a cell body, dendrites, and axon, which is surrounded by myelin sheath. The cell body connects dendrites and the axon and that way it takes part in communication between two neurons. In the cell body, there are all organelles as in any other cell, including mitochondria. Since, the energy is produced by mitochondria, and the cell body contains mitochondria, it could be concluded that the cell body produces energy that fuels the activities of the cell.