The correct option is D Axon
Neuron consists of cell body, dendrites and the axon. Cell body or cyton contains the nucleus and the cytoplasm. All the membrane bound organelles are present in the cell body. Dendrites are the short and branched projections arising from the cell body. They are responsible for receiving the signals. Axon is the long branch. It also arises from the cell body. It is responsible for conducting the signal towards the axon terminal.