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B
20 - 40 dB
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C
45 - 50 dB
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D
50 - 55 dB
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Solution
The correct option is A 20 - 40 dB
Noise or pollutant sound has a value of 80 dB and above. Moderate conversation produces 60 dB sound, loud conversation 70 dB and whispering has intensity levels between 20- 40 dB