It is difficult to isolate the precise damage caused by illegal drug use during pregnancy because
A) most drug-using mothers refuse to participate in teratology research.
B) the majority of babies born to drug-using mothers do not survive for more than a few days.
C) most drug-using mothers quit during the first trimester of pregnancy.
D) users often take several drugs, display other high-risk behaviors, and suffer from poverty and other stresses.
Answer: D
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