The half-life of $_6C^{14}$ if its decay constant $k$ or $\lambda$ is $2.31 \times 10^{-4} \ yr^{-1}$ is:
- A$2 \times 10^2 \ yrs$
- B$3 \times 10^3 \ yrs$
- C$3.5 \times 10^4 \ yrs$
- D$4 \times 10^3 \ yrs$
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