While Brit is standing in line to go bungee jumping with her friends, she is Extremely happy and excited, but she also feels her heart beating rapidly in anticipation of the jump. According to the circumplex model, Brit's emotions could be plotted on the positive end of the ________ continuum and on the high end of the ________ continuum.

a. mood; emotion
b. arousal; valence
c. emotion; mood
d. valence; arousal