The Nurse Explains to a Newly Diagnosed Type 1 Diabetic

The nurse explains to a newly diagnosed type 1 diabetic that the beta cells can no longer produce adequate insulin because:

A) they are inhibited by pituitary disorder.
B) an allergic response has altered their response to hyperglycemia.
C) alpha cells have proliferated in the islets of Langerhans.
D) the body's immune system has destroyed them.