One of the Major Difficulties in Determining the Exact Effects

Multiple Choice

One of the major difficulties in determining the exact effects of maternal cocaine use on prenatal development is the fact that

A) the infants are typically stillborn.
B) cocaine use has dropped dramatically and mothers who used cocaine while pregnant are now hard to find.
C) the effects appear to involve changes in zygotic DNA structure and our ability to identify such changes is limited by technology.
D) pregnant mothers who are using cocaine are also often ingesting other harmful substances.