At time \( t=0 \), number of nuclei of a radioactive substance are 100 . At \( t=1 \mathrm{~s} \...

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At time \( t=0 \), number of nuclei of a radioactive substance are 100 . At \( t=1 \mathrm{~s} \) these numbers become 90 . The number of nuclei at \( t=2 \mathrm{~s} \) is
(A) 50
(B) 80
(C) 70
(D) nuclei will remain undecayed
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