话题功能的综合表达 — 英语选择题

Amy 想邀请 Lingling 周六上午去图书馆看书，但 Lingling 周六上午要在家帮妈妈做家务，她想去但没空。Lingling 应该怎样礼貌地回复？A. No, I don't like reading books. B. Sorry, I can't come on Saturday morning. I have to help my mum at home. Can we go on Sunday morning? C. I'm busy. Don't ask me again. D. Yes, I'd love to. Let's go now.