How do competitive inhibitors affect the apparent Michaelis constant (Kₘ) and Vmax?

• A. They increase the apparent Kₘ and decrease the apparent Vmax.
• B. They increase the apparent Kₘ without affecting the apparent Vmax.
• C. They do not affect the apparent Kₘ or Vmax.
• D. They decrease both the apparent Kₘ and Vmax.

Answer: (B)