Compared to American School Children, Memory Performance in School Children

Compared to American school children, memory performance in school children from other cultures is:

A) consistently higher across age groups than that of American schoolchildren.
B) lower than that of American school children.
C) closer to that of American children than to the performance of non-schooled age mates from their own villages.
D) closer to that of unschooled age mates from their own village than to the performance of American school children.