Correct Answer: Herbivorous

Solution : The correct choice is the fourth option .

The word that can substitute for the given group of words "one who feeds on plants only" is herbivorous .

Examples of herbivorous animals include cows, horses, and rabbits.

The meanings of the other options are as follows:

• Vermivorous: It is a term used to describe organisms, particularly animals, that primarily feed on worms.
• Carnivorous: This term refers to an organism that primarily eats meat.
• Omnivorous: This term describes an organism that consumes both plant and animal matter.

Therefore, the correct answer is herbivorous.