Cheranita is experiencing the first stage of the general adaptation syndrome. an environmental stressor has triggered a process in her brain in which the activates the sympathetic branch of the nervous system, which stimulates the adrenal gland, which then secretes adrenaline.

The correct answer is hypothalamus; autonomic.
The General Adaptation Syndrome (GAS) is the sequence of physiological processes which occur when we are exposed to a stressor. GAS is comprised of three stages which are the alarm, the resistance, and the exhaustion phase.

The first stage, known as the alarm phase, involves the fight or flight response, which is the natural reaction when under threat. A distress signal is sent by the amygdala to the hypothalamus, which in turn activates the sympathetic branch of the autonomous nervous system. 

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