What Have the Natives from an Isolated Guatemalan Village Taught

What have the natives from an isolated Guatemalan village taught us about the capacity of children to recover from social deprivation?

A) Although the Guatemalan children were socially and physically isolated as infants, retarding their progress, they had higher than average IQs by 11 years of age.
B) Guatemalan children who were socially isolated as infants only recovered their physical and social abilities by age 11 if subsequently raised in industrialized societies.
C) Guatemalan children who were isolated during their first year of life were physically and socially retarded; yet they were able to catch up with other children by 11 years of age.
D) Only those Guatemalan children who were isolated as young infants and exposed to sufficient levels of natural sunlight were able to catch up with other children by 11 years of age.