Question

behavior is produced by complex interactions among sets of neurons in many areas of the

spinal cord.

immune system.

brain.

pancreas.

Explanation:

Neurons are the basic units of the nervous system, and the brain is the main organ of the central nervous system where complex neuron interactions occur to produce behavior. The spinal cord mainly handles reflexes and basic signal transmission, the immune system is for fighting infections, and the pancreas is for hormone (like insulin) and enzyme production, none of which are primarily involved in producing behavior via neuron interactions.

Answer:

C. brain.