The correct option is:
sympathetic nervous system
Stress is actually nothing but the bodies reacting to a challenge that it is faced with.
Step-by-step explanation:
In response to a stressor, the sympathetic nervous system choreographs what you familiarly call the fight-or-flight answer. It improves muscle blood flow and tension, stretches pupils, stimulates heart rate and respiration, and prolongs perspiration and arterial blood pressure.