Final answer:
Headaches, disturbed sleep, and difficulty focusing are a correct list of physical, emotional, and behavioral symptoms of stress, respectively.
Step-by-step explanation:
The question asks to identify a list of symptoms that includes a physical, emotional, and behavioral symptom of stress. The correct list of symptoms that aligns with these categories is headaches (physical), disturbed sleep (emotional), and difficulty focusing (behavioral). Headaches are common physical manifestations of stress and can be a result of muscle tension or other stress-related changes in the body. Disturbed sleep, including problems with falling or staying asleep, is often an emotional consequence of stress. Difficulty focusing can be considered a behavioral symptom because stress can affect cognitive functions, manifesting in an inability to concentrate or complete tasks effectively.