Psychological Stress is defined as:

• A. The body's chemical reactions to the demands placed on it.
• B. Mental stress resulting from difficult work or personal situations.
• C. The energy reserve available for flight.
• D. The process of firmware updates.

Answer: (B)

The main idea being tested is what psychological stress means in everyday terms: it’s the mental and emotional strain you feel when faced with challenging work or personal situations. That’s why the best choice defines psychological stress as mental stress resulting from difficult work or personal situations. It captures the subjective experience—the worries, tension, and pressure you perceive—rather than what happens inside the body.

The other options describe things that aren’t about the mental experience. The body’s chemical reactions to demands refer to the physiological stress response—hormonal and bodily changes that occur in reaction to stress—while not naming the mental experience itself. The energy reserve for flight and the process of firmware updates are unrelated to psychological stress.