[单选题]
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.
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