How does the inactivation of GSK 3 affect glycogen synthase activity?

• A. Inactivation of GSK 3 has no effect on glycogen synthase activity.
• B. Inactivation of GSK 3 degrades glycogen synthase, terminating glycogen synthesis.
• C. Inactivation of GSK 3 enhances the phosphorylation of glycogen synthase, inhibiting glycogen synthesis.
• D. Inactivation of GSK 3 prevents the phosphorylation and inactivation of glycogen synthase, allowing glycogen synthesis.

Answer: (D)