Answer:
prevalent = widespread
requisite = necessary
propagate = spread
Explanation:
A synonym is a word with a very similar meaning to another word. “Prevalent” is a synonym of “widespread” because it refers to something that is widespread in a particular area or at a particular time, or to something that is predominant; “requisite” means essential, required, indispensable, or necessary, and lastly, the meaning of “propagate” and “spread” is similar because the former is a verb that means “to spread and promote something like an idea or a theory, etc, widely.”
