The Mother of a 4-Year-Old Boy States, "I Can't Believe

The mother of a 4-year-old boy states, "I can't believe my son has type 1 diabetes. We eat well and I was so careful during the pregnancy. What could have caused this?" How should the nurse respond?

A) "There must have been something you were exposed to during your pregnancy that caused it."
B) "Are there others in your family who have type 1 diabetes?"
C) "He must have been allowed to eat too much sugar."
D) "We are not certain what causes type 1 diabetes."
E) "It is thought to be a combination of factors."