Answer:
option D
Explanation:
Catecholamine means dopamine, adrenaline and non-adrenaline. In fight and flight condition or challenge, catecholamine is released in body but limited release of cortisol because cortisol is released at specific condition like threat or arousal sense. So in physiological toughness model , body shows some adaptation to that incoming challenge, they consider it as challenge not as threat so the increased level of catecholamines show less fear in individual under study.
