[单选,材料题] According to the third paragraph，what will happen when the underground heat does not dis—ap
根据以下资料，回答下面的题目。
According to the first paragraph，one or the warnings given by the scientists is that
- A Coal heats up on its Own and catches fire and burns．
- B The underground oxygen will be used up．
- C Poisonous fumes and greenhouse gases wm be accumulated anderground．
- D There will be an increase of abandoned mines．