Which of the following statements is true of fetal alcohol syndrome?

a. the most severe impact caused by the intake of alcohol occurs during the first two months of pregnancy.
b. the intake of alcohol impairs the closure of the neural tube and causes spina bifida.
c. the symptoms of fetal alcohol syndrome resolve themselves as the infant becomes older.
d. the damage caused to the fetus can be reversed if the intake of alcohol stops during pregnancy
e. this type of birth defect is very rare, so it does not affect many children.