The correct option is D enhancing activity of most gastrointestinal functions
Parasympathetic system is a part of the autonomic nervous system. It primarily stimulates the body’s “rest and digest” response such as enhancing the activity of most gastrointestinal functions.
The sympathetic system is a part of the autonomic nervous system. It generally inhibits the activity of the gastrointestinal tract, causing many effects such as gastrointestinal secretion, motor activity, contraction of gastrointestinal sphincters and blood vessels, opposite to those of the parasympathetic system.
The central nervous system helps in learning a new language and controls the voluntary movement of the body.