In which scenario would a product act as an inhibitor to prevent excessive accumulation?

• A. When product F is at low concentrations, it activates enzyme 1.
• B. When product F is at low concentrations, it inhibits enzyme 1.
• C. When product F is at very high concentrations, it inhibits enzyme 1.
• D. When product F is at high concentrations, it activates enzyme 1.

Answer: (C)