It is difficult to isolate the precise damage caused by illegal drugs 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 using illegal drugs during the first trimester of pregnancy
D) drug users often take several drugs, display other high-risk behaviors, and suffer from other stresses


Answer: D

Psychology

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