Answer: B. An individual has an autoimmune disorder that destroys the beta cells of the pancreas.
C. An individual’s insulin receptors are defective.
Step-by-step explanation:
Diabetes mellitus is a common disease. In this disease the level of sugar in the blood is affected. This occurs when pancreas does not produce enough insulin or the receptors involving insulin also become resistant to insulin, which is a sugar balancing hormone.
Type 1 diabetes involves the complete lack of production of insulin by the beta cells of the pancreas. The beta cells of pancreas are destroyed by the body's self immune system.
Type 2 diabetes involves the development of insulin resistance by the target cells of the body. The insulin secretes but cannot compensate for the increase in blood glucose levels due to due to defective receptors on target cells.
On the basis of above explanation, B. and C. are the correct options.