In my opinion the correct answer is B) Indifferent
I believe that the narrator tells his story as a casual and everyday thing, without any particular emotion.
There are several situations in which imagination can overcome reason.
One of the most common ones are when you're paranoid or you are fearful of something. In this case, your imagination starts creating the worst possible scenarios that can ever occur. However, when going through the situation itself, you will actually find that it is less terrifying than what you imagined and that your were just trapped in your imagination. <span />
B. If I won the lottery, I'd buy a big house.