What is the function of the insulin hormone?

The correct answer is Option (2) → Regulates blood sugar level

Insulin is a hormone made by the beta cells of the islets of Langerhans in the pancreas. After a meal, when the glucose in the blood rises, insulin helps the body cells take up glucose and makes the liver and muscles store the extra as glycogen, so it lowers and regulates the blood sugar level.

When the body makes too little insulin, or does not respond to it, the blood sugar stays high: this is diabetes.