What Is a Good Rule of Thumb When Trying to Determine

What is a good rule of thumb when trying to determine the impact of environmental toxins on fetal development?

A) If it does not bother the mother, it will not bother the developing fetus.
B) If it does not bother young children aged 6 to 10, it will not bother the developing fetus.
C) The impact on fetal development must be assessed separately from the impact on children or adults.
D) The fetus is well protected. There are very few toxins to which it is likely to be vulnerable.