$Rn$ decays into $Po$ by emitting an $\alpha$-particle with a half-life of $4 \text{ days}$. $A$ sample contains $6.4 \times 10^{10}$ atoms of $Rn$. After $12 \text{ days}$,the number of atoms of $Rn$ left in the sample will be:
- A$3.2 \times 10^{10}$
- B$0.53 \times 10^{10}$
- C$2.1 \times 10^{10}$
- D$0.8 \times 10^{10}$
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