Who of the Following Is Probably an Adolescent (And Not

Who of the following is probably an adolescent (and not a child) ?

A) Maryann, who believes that people have complete control over their thoughts
B) Matthew, who believes that it is very possible to go for a long period of time without thinking about anything
C) Tamara, whose thinking is bound to observable events
D) Frank, who appraises his reading comprehension before starting the next chapter