单选题

　　[阅读理解]Decibels（分贝） measured in water are different from those measured on land. A noise of one hundred-twenty decibels on land causes pain to human ears. In water， a decibel level of one-hundred ninety-five would have the same effect.

　　Which of the following is discussed in the paragraph？

　　A.The same noise level produces a different effect on land and in the ocean.

　　B.Different places may have different types of noises.

　　C.The decibel is not a suitable unit for measuring underwater noise.

　　D.Different ocean animals may have different reactions to noises.