What happens to enzyme activity when an inhibitor binds to form EI and ESI complexes?

• A. Enzyme activity decreases because the inhibitor prevents substrate binding.
• B. Enzyme activity remains unchanged because the inhibitor does not affect substrate binding.
• C. Enzyme activity increases because the inhibitor stabilizes the enzyme.
• D. Enzyme activity fluctuates unpredictably due to inhibitor binding.

Answer: (A)