Final answer:
Charlie's relaxed manner in stressful situations indicates resilience, the psychological capacity to adapt to stress, rather than the fight-or-flight response. The correct answer is option B).
Step-by-step explanation:
Charlie's relaxed and easygoing response when facing stressful life events illustrates the role of resilience in response to stress. This term refers to the ability to recover from or adapt well to adversity, trauma, tragedy, threats or significant sources of stress. While the fight-or-flight response is a physiological reaction to perceived harmful events, attacks, or threats to survival, it does not adequately explain Charlie's behavior during stressful situations. Instead, Charlie's approach suggests a psychological capacity to handle stress in a healthy way, which is indicative of resilience.