In response to your questions about social activities, Venira says she and her boyfriend have been dating for two years now, and they are very happy together. Something about her expression makes you think there might be more to the story, however. After a moment, she adds that her boyfriend, a high school football star, has been getting more and more aggressive and recently hit her during an argument. Which of the following might be the cause of this change in his behavior?

A) Librium
B) Ecstasy
C) Anadrol
D) Marijuana
E) Valium