[单选题]

阅读文章，回答问题。
Which of the following，according to the passage，is a list of three natural sources of radiation？( )

A.Radioactive potassium in bone，strontium 90，uranium ore.

B.Carbon 14 in tissues，cosmic rays，X rays.

C.Cosmic rays，radioactive potassium in bones，radioactive carbon in tissues.

D.X rays，carbon 14，plutonium.

参考答案与解析：

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