A 30-year-old Hispanic woman in the second trimester of pregnancy receives a 100-g oral glucose challenge. She has elevated values of serum glucose at each of the 1-,2-, and 3-h time points. Which of the following statements concerning this clinical situation is correct?
(A) A trial of caloric restriction and minimal intake of concentrated sweets should be undertaken
(B) The patient should be given subcutaneous insulin therapy
(C) The patient should be treated with oral hypoglycemic agents
(D) The patient should be treated with magnesium sulfate
(E) The patient should receive insulin by continuous intravenous infusion