What Is a Common Reason That Assessing for Side Effects

What is a common reason that assessing for side effects of medications during pregnancy is challenging?

A) Drug doses are decreased during pregnancy to decrease the incidence of side effects.
B) Adverse effects of medications are not experienced as often with pregnant women.
C) Adverse effects of medications are often similar to common discomforts of pregnancy.
D) The mother has increased blood volume, so the drugs may not be strong enough to produce side effects.