Final answer:
The psychosocial model best describes a model used to explain reactions to stressors, emphasizing the physiological process outlined by Hans Selye's general adaptation syndrome, with stages of alert reaction, resistance, and exhaustion, which can result in health problems.
Step-by-step explanation:
The model used to explain reactions to stressors is best described as the psychosocial model (B). Hans Selye's concept of the general adaptation syndrome is a foundational theory that outlines how the body physiologically reacts to stress through three stages: the alert reaction, the stage of resistance, and the stage of exhaustion. The persistent activation of the body's stress response can lead to a variety of health issues, such as hypertension and coronary artery disease. Selye's model has significantly impacted our understanding of stress, highlighting the physical consequences of prolonged or repeated stress on the body.