The correct option is C you had better try to
Had better is used in an informal style when you suggest someone advice as to what he should do in a particular situation. The situation usually exists during moments of speaking and so there is little sense of urgency in the advice offered. However, to give advice on a general situation or to suggest that one course of action is better than the other, we use “should, ought to or would be better to “ .So the correct usage will be –Instead of crying over spilled milk, you should try to sort out your differences first.