The correct option is
B Glycogenolysis
A. Glycogenolysis is the breakdown of glycogen into glucose.
B. Glycogenesis is the synthesis of glycogen.
C. Proteolysis is the breakdown of protein molecules.
D. Cytolysis is the bursting of cell due to osmotic imbalance.
αα - cells are part of islets of Langerhans in pancreas and secrete glucagon hormone which increases blood sugar level by stimulating glycogenolysis (i.e. break down of glucose) and gluconeogenesis (synthesis of glucose).
Hence, if αα - cells of pancreas are destroyed, then glycogenolysis will be affected.
So, the correct answer is 'Glycogenolysis'.