Final answer:
Uncontrolled blood glucose levels early in pregnancy can have negative effects on fetal development, increasing the risk of birth defects, miscarriage, and stillbirth.
Step-by-step explanation:
The correct answer is (D) Uncontrolled blood glucose levels early in pregnancy cannot improve the health of the fetus. Uncontrolled blood glucose levels early in pregnancy can actually have negative effects on fetal development. High blood glucose levels can potentially lead to birth defects, increase the risk of miscarriage, and increase the risk of stillbirth.