“So, Sven, you've been learning English for ten years. That's a long time.”-“____”

A. Yes, so what? I want to keep learning until I can hold a conversation like a native speaker.

B. It's none of your business! I want to keep learning until I can hold a conversation like a native speaker.

C. I suppose it is, but I want to keep learning until I can hold a conversation like a native speaker.

D. Well, look at yourself first. I want to keep learning until I can hold a conversation like a native speaker.