The reaction $X \rightarrow \text{products}$ is a first order reaction. In $40 \text{ minutes}$,the concentration of $X$ changes from $1.0 \text{ M}$ to $0.25 \text{ M}$. What is the rate of reaction when $[X] = 0.1 \text{ M}$? $(\log 4 = 0.60)$

• A
  $1.73 \times 10^{-3} \text{ mol L}^{-1} \text{ min}^{-1}$
• B
  $3.47 \times 10^{-4} \text{ mol L}^{-1} \text{ min}^{-1}$
• C
  $1.73 \times 10^{-4} \text{ mol L}^{-1} \text{ min}^{-1}$
• D
  $3.47 \times 10^{-3} \text{ mol L}^{-1} \text{ min}^{-1}$