The graph illustrates how reaction rate varies with substrate concentration for the following conditions: • no inhibitor added • inhibitor X • inhibitor Y. One inhibitor acts competitively, whereas the other is non-competitive. Which estimate of $K_m$ is correct for the reaction shown if a competitive inhibitor is present?
- A$0.11\,\text{mol dm}^{-3}$
- B$0.23\,\text{mol dm}^{-3}$
- C$0.38\,\text{mol dm}^{-3}$
- D$0.65\,\text{mol dm}^{-3}$