How would a Michaelis-Menten plot change in the presence of a noncompetitive inhibitor?

• A. Both Vmax and Km increase, resulting in a higher plateau.
• B. The Vmax remains the same, and the Km decreases, resulting in a steeper initial slope.
• C. The Vmax decreases, and the Km remains the same, resulting in a lower plateau.
• D. Both Vmax and Km decrease, resulting in a lower plateau.

Answer: (C)