Which of the Following Is Most Likely to Be a "Cobra

Which of the following is most likely to be a "cobra" abuser

A) Tom, whose arousal level increases dramatically during an argument. He eventually becomes so enraged that he hits someone.
B) Jim, whose arousal level decreases during an argument. He calmly waits and uses violence when ready.
C) Bob, who withholds all emotion during an argument until he explodes with rage. He becomes violent and then immediately returns to baseline.
D) Sam, whose arousal level remains constant. He uses violence before an argument progresses, to keep other people "in line."