$K-40$ is a natural radioactive isotope which constitutes $0.012\%$ of natural potassium. If a cup of milk contains $370 \ mg$ of $K$,how many atoms of $K-40$ are ingested?
- A$6.69 \times 10^{21}$
- B$6.69 \times 10^{17}$
- C$6.69 \times 10^{20}$
- D$6.69 \times 10^{25}$
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