The nervous system is also referred to as the rest and digest system.
a. pathetic
b. sympathetic
c. parasympathetic
d. metabolic

C. parasympathetic

Explanation:

The autonomic nervous system continuously sends impulses to the visceral organs, whose functional activity depends at every moment on the sympathetic and parasympathetic discharge rhythm.

The parasympathetic nervous system acts to restore the normal functioning of the body after it has experienced stress, nerves or adrenaline release. That is, heart rate, blood pressure and adrenaline levels return to normal. This system is also called the rest and digestion system.

In the parasympathetic autonomic nervous system, the fibers come from the midbrain, the bulb, and the sacral region of the spinal cord and form part of the cranial nerves III, VII, IX, and X, d of the pelvic nerve from the lower part of the medulla.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.