Which option lists elements that are part of the structure of a neuron?

• A. Dendrites
• B. Axon
• C. Synapse
• D. Dendrites, cell body, axon, synapse, myelin sheath

Answer: (D)

Neurons have several structural parts that work together to receive, process, and send signals. Dendrites pick up signals from other neurons, the cell body integrates those inputs, the axon transmits the signal onward, the synapse is where communication occurs with the next cell, and the myelin sheath speeds up transmission along the axon. This set reflects the major components you’re expected to know for neuron structure, so it’s the best fit. The other options name only one part at a time, which doesn’t capture the full structure. Remember that some neurons aren’t myelinated, but many are, and these parts together describe the common architecture of neurons.