Final answer:
Harmful levels of stress can lead to physical and emotional health issues, as excessive or chronic stress contributes to various physiological, cognitive, and behavioral challenges, along with the potential development of various health disorders.
Step-by-step explanation:
A person under harmful levels of stress may experience a range of adverse effects. While a moderate amount of stress can lead to increased focus and productivity, excessive stress, or distress, can lead to serious implications for physical and emotional health.
Upon reaching harmful stress levels, a person might suffer from physiological symptoms like headaches, cognitive challenges including a difficulty in concentrating or making decisions, and behavioral changes possibly leading to unhealthy coping mechanisms. Furthermore, when stress becomes chronic, it can precipitate psychophysiological disorders, weaken immune system functioning, and contribute to the development of heart disease, among other conditions.
The correct answer to the question is that a person under harmful levels of stress may experience C) Physical and emotional health issues, as excessive stress can lead to a decline in both mental and physical well-being, affecting overall health and potentially leading to a host of different disorders.