Which of the Following Adolescents Best Exemplifies the Differential Susceptibility

Which of the following adolescents best exemplifies the differential susceptibility theory?

A) Nela's first year of college was very stressful and her grades and her mood were poor. After finding a supportive mentor, however, she became a top student and is now much happier.
B) Bashar has battled addiction problems for several years, and although he has made many changes to his life and sought help on several occasions, nothing seems to help.
C) Kirra has a difficult relationship with her divorced parents and lives in a poor neighborhood. Nevertheless, Kirra strives to do well in school and make the best of her situation.
D) Sergey's parents use an authoritative style and give him a lot of emotional support. In spite of this, Sergey engages in delinquent behavior, skipping school and using alcohol.