Select the option that can be used as a one-word substitute for the given group of words.
One who brings a legal action against someone in court.

Correct option is A

The correct one-word for the given group of words is (a) Plaintiff.
Explanation:
A plaintiff is a person who brings a case against another in a court of law.
Example: The plaintiff argued that the contract had been violated.
Meanings of the given other options:
· (b) Numismatic: Related to coins or currency collection.
· (c) Sanctimonious: Pretending to be morally better than others.
· (d) Pragmatist: A person who deals with things sensibly and realistically.