Which one of the following formulas represents a first-order reaction?
- A$K = \frac{x}{t}$
- B$K = \frac{1}{2t} \left[ \frac{1}{(a - x)^2} - \frac{1}{a^2} \right]$
- C$K = \frac{2.303}{t} \log_{10} \frac{a}{(a - x)}$
- D$K = \frac{1}{t} \frac{x}{a(a - x)}$
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