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For a reaction A Product, rate law is $-\frac{d\left[A\right]}{dt}=K\left[A{\right]}_{0}$. The concentration of A left after time t when $t=\frac{1}{K}$ is:

(a) $\frac{\left[A{\right]}_{0}}{e}$

(b)

(c) $\frac{\left[A{\right]}_{0}}{{e}^{2}}$

(d) $\frac{1}{\left[A{\right]}_{0}}$