With Regard to Optimal Arousal, Hebb Specifies Two Assumptions

With regard to optimal arousal, Hebb specifies two assumptions:

A) arousal invokes pleasure, and arousal can't be maintained for an extended period of time.
B) arousal is solely a physiological concept, and behavior is affected at an optimal level of arousal only.
C) arousal is a generalized concept, and optimal arousal is resisted by the organism.
D) optimal level of arousal is task specific, and an organism acts to maintain the level that is appropriate for the ongoing behavior.