One of the Most Consistent Findings from Studies Examining the Effects

One of the most consistent findings from studies examining the effects of smoking on prenatal development is that babies born to smokers

A) are more likely to be mentally challenged than babies born to nonsmokers
B) are more likely to have learning disorders than babies born to nonsmokers.
C) are likely to be smaller in size than babies born to nonsmokers.
D) are not distinguishable from babies born to nonsmokers.