(B) The intensity of sound is measured in decibels $(dB)$.Normal conversation typically occurs at an intensity level ranging from $35$ to $60\, dB$.So

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(B) The intensity of sound is measured in decibels $(dB)$.Normal conversation typically occurs at an intensity level ranging from $35$ to $60\, dB$.Sounds below $30\, dB$ are considered very quiet (like a whisper),while sounds above $80-90\, dB$ can be harmful to the human ear over prolonged exposure.