How far must one stand from a \( 5 \mathrm{~mW} \) point sound source if the intensity is at the...

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How far must one stand from a \( 5 \mathrm{~mW} \) point sound source if the intensity is at the hearing threshold? Assume the sound waves travel to the listener without being disturbed.
(A) \( 500 \mathrm{~m} \)
(B) \( 2 \mathrm{~km} \)
(C) \( 20 \mathrm{~km} \)
(D) \( 1 \mathrm{~km} \)
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