Which of the Following Is Most Likely to Help Mothers

Which of the following is most likely to help mothers with diabetes reduce the risk of diabetes-associated birth defects?

A) Using multivitamin supplements during the first 3 months of pregnancy
B) Performing strenuous exercise, including weightlifting, during the first 3 months of pregnancy
C) Consuming a controlled diet rich in protein throughout pregnancy
D) Increasing the intake of leafy green vegetables in the last 3 months of pregnancy