According to social-cognitive psychologists, one of the best ways to predict a person's future behavior is to identify that person's most central traits by having him or her take a personality inventory. observe that person's behavior in various relevant situations. assess that person's general level of self-esteem. uncover that person's hidden motives, as revealed by projective tests.

The correct choice is "observe that person's behavior in various relevant situations".

In psychology Social cognitive theory or SCT, explains that various aspect of a person’s knowledge and information can be traced back to seeing and observinf other people in the society in context of social contacts, understandings, and external media affects.

glass wants to live in a world of super heroes and villains. he have lived all his life trying to be responsible for the creating the origin story of a super hero; he schemed and caused many incidents (many of them fatal) hoping that someday someone with superpowers would show up and save the day.

he knew himself very much. he saw himself as a villain of a real-life super hero story. he was aware of his strengths (more than smart enough for being manipulative and scheming) and weaknesses (having fragile bones and having to rely on his mind to succeed).