The graph illustrates how the concentration of substrate is related to the rate of an enzyme-catalysed reaction. Which row indicates the effect on $K_m$ and $V_{max}$ for this enzyme if the same reaction were conducted with a competitive inhibitor present?
- A$K_m$ increases, $V_{max}$ decreases
- B$K_m$ increases, $V_{max}$ remains the same
- C$K_m$ remains the same, $V_{max}$ decreases
- D$K_m$ remains the same, $V_{max}$ remains the same