Correct Answer: A

Rationale: Insulin lowers blood glucose by facilitating cellular uptake of glucose, particularly in muscle and adipose tissue, and promoting glycogen synthesis in the liver. The observed drop from 11.5 to 6.8 mmol/L confirms these anabolic effects. While it indirectly suppresses glucagon, its main mechanism is receptor-mediated glucose transport enhancement. It does not affect intestinal absorption or directly promote renal glucose excretion. These properties make insulin essential for managing both type 1 diabetes and uncontrolled type 2 diabetes when oral agents are insufficient.

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