Which of the Following Has Not Been Proposed as an Explanation

Which of the following has not been proposed as an explanation for how humor helps to reduce the effects of stress and promote wellness?

A) Humor increases the experience of positive emotions.
B) Humor facilitates rewarding social interactions.
C) Humor facilitates the release of stress-relieving neurotransmitters.
D) Humor affects appraisals of stressful events.