At any instant the ratio of the amount of radioactive substances is \( 2: 1 \). If their half-li...

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At any instant the ratio of the amount of radioactive substances is \( 2: 1 \). If their half-lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances?
(A) \( 1: 1 \)
(B) \( 2: 1 \)
(C) \( 1: 2 \)
(D) \( 1: 4 \)
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