Answer:
3. Macbeth is realizing that all of his striving for power has been for nothing.
Step-by-step explanation:
In the given lines, Macbeth speaks about his thoughts related to life and death. He gets the news of the death of wife after which he spoke these lines. He wonders what life is all about. He explains his view that life is not more than an illusion. It is a story which an idiot tells and which has no meaning behind it. He also highlights that power now means nothing as it would not be felt throughout life.