Greg and Peter Were Talking About Their Brother Bobby

Greg and Peter were talking about their brother Bobby. "I don't see how he does it," states Peter. "If I were in his situation, I'd be so stressed that I would make myself sick! And Bobby seems to be just fine!" Greg responds, "Well, Peter, I believe that Bobby has a disease-resistant personality, which means he possesses

A) a sense of denial about the challenges he faces."
B) a lower alarm reaction threshold."
C) dispositional optimism and social dependability."
D) more natural killer and B cells than most people."