Correct option is D
The liver breaks down stored glycogen into glucose during glycogenolysis, maintaining blood sugar levels. Explanation of options:
· (a) ✘ Excretion is primarily kidney’s role.
· (b) ✘ Histolysis is cell breakdown, unrelated.
· (c) ✘ Digestion is aided via bile but not a direct function.
· (d) ✔ Correct; vital metabolic function of liver.