Children with this condition unusually demonstrate facial abnormalities, central nervous system dysfunction, and altered brain development. they also experience difficulty with attention, learning, memory, regulation of emotions, and executive functioning. their mothers' drinking during pregnancy increases the likelihood of this form of intellectual disability, which is estimated to occur in less than 1% of live births in the united states. what is the condition? a. fetal alcohol syndrome b. down syndrome c. phenylketonuria (pku) d. environmentally caused intellectual disability