A、Are you listening to me? B、Are you clear? C、Are you still in the room? D、Are you still my friend? BWhat does "Are you with me?

W: What are you doing, Bill? Writing a letter?
M: Yes, and it’s not easy.
W: My Aunt Mabel sent me a gift for my birthday. I can’t remember which gift was hers, but I want to thank her for it.
M: Oh, that’s a difficult problem. When it happens to me, I just write to say" Thank you for the wonderful girl" without saying what a gift was. Are you with me?
W: Yes, thanks. That’s a clever idea.
M: When you have a bad memory, you have to be clever.