Answer:
d. stressor; stress reaction
Explanation:
In psychology, the term stressor refers to an stimulus, event or situation that cause a reaction of tension or stress in a person. Stressors usually create physical reactions to them.
In this example, rush hour traffic can create tension in a person (therefore it is considered a stressor) and the physical reaction it creates is an upset stomach. (which would be a stress reaction). Therefore, the correct answer is d. stressor; stress reaction
