The correct answer is choice D. No history of endocrine disorder. This is because having a history of endocrine disorder, such as thyroid disease or polycystic ovary syndrome, can increase the risk of developing gestational diabetes.

Choice A is wrong because being of African-Caribbean origin is not a risk factor for gestational diabetes. The ethnic groups that have higher risk include Asian, Hispanic, Native American, and Pacific Islander.

Choice B is wrong because normal body mass index (BMI) is not a risk factor for gestational diabetes. On the contrary, having a high BMI (over 30) before pregnancy or gaining too much weight during pregnancy can increase the risk of gestational diabetes.

Choice C is wrong because no family history of diabetes is not a risk factor for gestational diabetes. Having a family history of diabetes, especially in a first-degree relative (such as a parent or sibling), can increase the risk of gestational diabetes.

Normal ranges for blood glucose levels during pregnancy are:

• Fasting: less than 95 mg/dL

• One hour after meal: less than 140 mg/dL

• Two hours after meal: less than 120 mg/dL