Doting means to adore, love, or to be extremely fond of someone.
The correct answer is that he has lost his mind.
Ophelia thinks that Hamlet has finally gone completely mad after saying those words to her. She is confused because one day, he would be totally normal, and the other, he would be saying such phrases to her that hurt her. She wishes he would be normal again and that they could be happy, but unfortunately, that doesn't happen as she kills herself, and he is murdered in the end.
i cant even see the 3rd one so how am i supposed to answer?