2.) C. Pocket Aces is a monster hand at any time, never mind heads up. The goal here is to keep your opponent involved whilst making it easier for you to get a read on his two cards. You don't want to force him out, but then again, you don't want him to see a flop for free.
Questions like #2 dont really have a correct answer. Based on how your opponent is playing, it may be correct to pick A or B as well. I dont like quizzes like this because they only give you a very small piece of the situation and expect you to make a decision without 90% of the information you would actually have.
Maybe you should make a large raise because every previous time you have done so, you have been called to the river and caught with a horrible hand. Maybe you should just check because every time you have done so before, your opponent has made a huge bet on the flop because he sensed weakess. There is no right answer.