Which best describes the parasympathetic nervous system?

a. the brain and spinal cord
b. rest and digest
c. fight or flight
d. the sensory and motor neurons

The correct answer is -

B. rest and digest.

Parasympathetic nervous system is one of the two branches of autonomic nervous system, which is also called as rest and digest system of the body.

This system is stimulated by the neurotransmitter Acetylcholine and it conserves energy by slowing down the energetically driven processes (such as it slows the heart rate) and therefore termed as rest and digest system.

Thus, option B) is the right answer.