A Woman Smokes During Pregnancy and Has a Baby with Learning

A woman smokes during pregnancy and has a baby with learning problems. Which assumption would a developmentalist MOST likely make?

A) The problem may or may not be due to smoking as this woman could have put her baby's health at risk in other ways.
B) Smoking definitely caused these problems.
C) An experiment can easily be done to show if smoking was the cause of this baby's difficulties.
D) A correlational study will give answers as to whether smoking was the cause of this baby's learning problems.