A: Hello? B: Hi, it's Mark. I was wondering if you're free on Saturday evening? A: Oh, hi Mark! Yes, I think so. Why? B: Well, I'm planning a small gathering at my place. Would you like to come? A: That sounds great! I'd love to. B: Perfect! See you then. A: ______. Bye! Which of the following is the most appropriate closing for A's part of the conversation?
A) I'm not sure if I can make it.