The most appropriate definition of a stressor is

Question

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A stressor is typically defined as any event, situation, or experience that causes a physical or emotional response in the body. These demands can be external (such as a job loss or relationship conflict) or internal (such as chronic pain or a health condition). B is the best choice as it specifically mentions "demand" which encompasses the variety of stressors that one might experience. Option A refers to a feeling, Option C defines the consequence of stress rather than stressor, and Option D refers to a reaction rather than a cause.

The Most Appropriate Definition of a Stressor Is