单选题：根据以下材料，回答题。What is the mystery that researchers find hard to

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题目类型：单选题
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根据以下材料，回答题。

What is the mystery that researchers find hard to explain?
A. Honeybees are flying all across the country.　　　　
B. 25—40 percent of the honeybees in the US have died.
C. Honeybees are leaving their hives and do not return.
D. Honeybee hives are in disorder.

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分类：理工类题型：单选题