An enzyme functions optimally at a pH of 7.4 and a temperature of 37°C. What would most likely happen to its activity if the pH was lowered to 2.0?

✓ Correct Answer: Option B

Enzymes are sensitive to pH changes. A significant deviation from the optimal pH alters the charge distribution on amino acids, disrupting the enzyme's 3D structure and active site, leading to denaturation and loss of activity.