The correct answer is

A. Polyuria, polydipsia, and polyphagia.

These are the classic signs and symptoms of diabetes, which occur due to high blood sugar levels. Gestational diabetes is a type of diabetes that develops during pregnancy and can affect the health of the mother and the baby.

B. Hypotension, bradycardia, and bradypnea.

Statement is wrong because these are signs of low blood pressure, low heart rate, and low breathing rate, which are not related to gestational diabetes.

C. Nausea, vomiting, and abdominal pain.

Statement is wrong because these are signs of ketoacidosis, a serious complication of diabetes that occurs when the body breaks down fat for energy and produces ketones. Ketoacidosis is rare in gestational diabetes and usually affects people with type 1 diabetes.

D. Headache, blurred vision, and drowsiness.

Statement is wrong because these are signs of hyperglycemia (high blood sugar) or hypertensive disorders (high blood pressure), which can occur in gestational diabetes but are not specific to it. They can also be caused by other conditions such as dehydration, infection, or preeclampsia.

Normal ranges for blood sugar levels during pregnancy are:

• Before meals: 3.5 to 5.9 mmol/L (63 to 106 mg/dL)

• One hour after meals: 7.8 mmol/L (140 mg/dL) or less

• Two hours after meals: 6.4 mmol/L (115 mg/dL) or less