Isaac Is Interested in Studying the Effects of Maternal Drug

Isaac is interested in studying the effects of maternal drug use during pregnancy on the developing fetus.He proposes recruiting pregnant volunteers from a local neighbourhood where numerous drug addicts are known to live.He argues that because all participants would be volunteers, it would not be unethical to administer controlled doses of various drugs to the pregnant women.Under current ethical guidelines, would Isaac's research proposal be accepted?

A) yes, because the participants would be volunteers and would not have to agree if they didn't want to
B) no, because he would have to recruit women who were not yet pregnant and follow them through the entire pregnancy
C) no, because the potential harm to the unborn infants would be too great
D) yes, because the women who are using drugs have already put their unborn infants at risk