The correct option is C hormone
Insulin is a hormone synthesised by the pancreas. It plays an important role in regulating the blood sugar levels in the body. It is a protein hormone.
It is not a vitamin. Vitamins are substances essential in the diet and are needed by the body in small amounts for proper functioning. They are much smaller organic molecules than proteins.
It is not a lipid. Lipids are water-insoluble biomolecules.
Insulin is not an enzyme either. An enzyme is a biological catalyst.