A、  B、  C、  A(A)针对是否暖和的询问，首先做出了肯定回答，之后说暖气是开着的，前后衔接顺畅。(B)利用与问题中的warm相关的词jacket。易造成误导。(C)不可以用can来回答，所以此项是错误的。

Will you help me move these bags?
(A)Because I want to buy a bag.
(B)I’d be happy to, where would you like them?
(C)Thanks for the offer.

It’s warm in here, isn’t it?
(A)Yes, the heater is turned on.
(B)I need a jacket.
(C)Sure, I can.