Which of the Following Statements Is the Worst Advice for Pregnant

Which of the following statements is the worst advice for pregnant women regarding the use of vitamin and mineral supplements?

A) Take large doses of vitamins and minerals to avoid problems such as spina bifida and anencephaly in your infant.
B) Take adequate amounts of folic acid as soon as you know you are trying to get pregnant, or know you are pregnant, to avoid neural tube defects.
C) Take adequate amounts of magnesium and zinc to improve functioning of the placenta and reduce some birth complications.
D) Take adequate amounts of iodine to ensure normal thyroid function and to avoid irreversible intellectual disabilities in your infant.