According to the general adaptation syndrome (GAS), described by Selye, the appearance of a threat in the environment will trigger:

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The general adaptation syndrome, as described by Selye, consists of three stages: alarm reaction, resistance reaction, and exhaustion. The first stage is the alarm reaction, which is triggered by the appearance of a threat in the environment. This stage involves a physiological response in which the body prepares to fight or flee from the threat. Therefore, choice A is the best answer. Choice B refers to the second stage, resistance reaction, which involves adapting to the stressor and trying to restore the body to its normal state. Choice C refers to the third stage, exhaustion, which occurs if the stressor persists for a long time and the body's resources are depleted. Choice D refers to the psychological experience of stress, which is not one of the stages in Selye's model.

According to the General Adaptation Syndrome (GAS), Described by Selye