store fuel for later use. regulate the amount of glucose in the blood. increase the efficiency of fuel consumption. prevent digestive bacteria from consuming glucose.
I gave my students this multiple choice question: The primary function of insulin in our bodies is to

Only one answer is correct among these 4 choices:
- store fuel for later use.
- regulate the amount of glucose in the blood.
- increase the efficiency of fuel consumption.
- prevent digestive bacteria from consuming glucose.

Could you tell me which one is correct?

regulate the amount of glucose in the blood.