The rate of radioactive disintegration at an instant for a radioactive sample of half-life $2.2 \times 10^9 \; s$ is $10^{10} \; s^{-1}$. The number of radioactive atoms in that sample at that instant is,
- A$3.17 \times 10^{20}$
- B$3.17 \times 10^{19}$
- C$3.17 \times 10^{17}$
- D$3.17 \times 10^{18}$
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