Honestly, I would pick just one option - the guilt and regret he expresses in his soliloquy.
This is the moment when Claudius admits that killing his own brother was wrong, however, he asks forgiveness and says that it is too late for him to stop now.
He doesn't really feel any sympathy for Ophelia - once he no longer needed to use her as his pawn, he discarded her. His offer to help Laertes get his revenge wasn't because of his morality, but rather fear that Hamlet might kill him. Him keeping secret about the letter is also immoral, given that the letter is an order for Hamlet to be executed.