Stephanie's Doctor Reduces the Dosage of Her Daily Medication When

Stephanie's doctor reduces the dosage of her daily medication when she begins trying to get pregnant.The principle behind this action states that:

A) teratogens can affect a woman's menstrual cycle.
B) the genotype of the child could be so closely linked to that of the mother that it will benefit from the medication in the same way the mother does.
C) the greater the dose of a teratogen, the greater the effect on prenatal development.
D) the effect of any teratogen is greater in the early stages of prenatal development.