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.