单选题：According to the speaker, why do pesticides pose a threat to

题目内容：
According to the speaker, why do pesticides pose a threat to amphibians? A．Pesticides can cause an amphibian's skin to dry out.
B．Pesticides kill the insects that amphibians depend on for food.
C．Dissolved pesticides can easily enter amphibian's bodies.
D．Amphibians may eat plants that have been treated with pesticides.
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