Answer:
Impromptu.
Explanation:
As per the question, Aiden is asked to deliver an 'impromptu' speech as he got very little time i.e. two minutes for the preparation of the speech. 'Impromptu' speech is described as the speech that is delivered without any kind of preparation. Such speeches are delivered with little or no preparation time and requires advanced knowledge about the subject and follows a defined structure and clear ideas. Thus, 'impromptu' speech is the correct answer.