মানুষের জন্য শব্দের নিরাপদ প্রাবল্য মাত্রা (WHO অনুযায়ী) কত?

A 65 dB

B 45 dB

C 85 dB

D 100 dB

Correct Answer & Explanation

Option B

Option B is the correct answer according to official curriculum guidelines.

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