玻璃瓶中装入摇匀的糖水和酵母，能把套在瓶口的小气球胀大，原因是

题干

玻璃瓶中装入摇匀的糖水和酵母，能把套在瓶口的小气球胀大，原因是（）

A：瓶中有水蒸气

B：瓶中产生了氧气

C：瓶中产生了酒精

D：瓶中产生了二氧化碳

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