Robin has been called on by her instructor to give a speech. if robin perceives giving a speech as stressful, it is most likely that her body will immediately experience which phase of the general adaptation syndrome

The answer is "Alarm reaction".

Alarm response refers to the early stage of general adaptation syndrome; when someone’s body reacts to a jolt or motivation which it considers stressful, like in the above case Robin’s call for a speech. It will increase the Hormonal activities inside Robin’s body releasing cortisol as stress hormone and Robin will get a boost of adrenaline. This is no controlled response rather it is automatically triggered in situations.

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as you did not provide any choices for me to choose from to give you a direct answer, this is the only information i can provide.