If \( 20 \mathrm{gm} \) of a radioactive substance due to radioactive decay reduces to \( 10 \ma...

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If \( 20 \mathrm{gm} \) of a radioactive substance due to radioactive decay reduces to \( 10 \mathrm{gm} \) in 4 minutes, then in what time \( 80 \mathrm{gm} \) of the same substance will reduce to \( 10 \mathrm{gm} \) ?
(A) 8 minutes
(B) 12 minutes
(C) 16 minutes
(D) 20 minutes
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