Based on its structure, which word most likely means "someone who takes advantage of circumstances”? credulous disdainful proactive opportunistic

This would be third person because they are using the correct pronouns that belongs to third person like he, the name, etc

Adjective clauses  begin with words such as that, when, where, who, whom, whose, which, and why. an essential (or restrictive)  adjective clauseprovides information that is necessary for identifying the word it modifies. so for example*** wrong= i the man gave me direction. example right ( i the man who gave me the  direction.

The answer is holding on to the past