Which of the Following Is a Feature of Heavy Metal

Which of the following is a feature of heavy metal intake and pregnancy?

A) Mercury,but not lead,can easily cross the placenta
B) Lead and mercury both damage the fetal nervous system
C) Pregnant women are advised to limit consumption of shark and swordfish to no more than once per week
D) Pregnant women are advised to avoid shellfish around the critical period of brain development but may resume normal intake thereafter