In a first order reaction,the ratio $\frac{a}{a-x}$ was found to be $8$ after $10 \, \text{min}$. The rate constant is:
- A$\frac{2.303 \times 3 \log 2}{10}$
- B$\frac{2.303 \times 2 \log 3}{10}$
- C$10 \times 2.303 \times 2 \log 3$
- D$10 \times 2.303 \times 3 \log 2$
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