Why is glucokinase activity in the liver primarily influenced by glucose supply rather than demand?

• A. Because glucokinase is inhibited by glucose 6-phosphate.
• B. Because glucokinase has a lower Km than hexokinase.
• C. Because the liver needs to store glucose as glycogen regardless of blood glucose levels.
• D. Because the liver's role is to maintain blood glucose levels by processing excess glucose.

Answer: (D)