Which of the Following Observations Convinced Many Scientists and Physicians

Which of the following observations convinced many scientists and physicians that environmental agents can seriously harm human embryos?

A) Infants born to mothers exposed to atomic fallout had behavioral problems.
B) Mothers exposed to rubella gave birth to fetuses with various anomalies.
C) Mothers treated with thalidomide during pregnancy gave birth to severely deformed children.
D) Mothers with a family history of a disorder were more likely to give birth to a baby with a birth defect.