In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.
A person who pleads for a person, cause, or idea.
Let's find out the meanings of given options:-
Affluent: A group or an area having a great deal of money or being wealthy.$
Toady: a person who behaves obsequiously to someone important.$
Advocate: a person who puts a case on someone else's behalf.$
Rescind: revoke, cancel, or repeal (a law, order, or agreement).$
Clearly, option 3 i.e. advocate best describes the above-mentioned phrase. Hence, it is the correct option.$