A Number of Cross-Cultural Studies of Mathematical Aptitude Have Compared

A number of cross-cultural studies of mathematical aptitude have compared the performance of North American students with that of Asian students.Compared to their age-mates from Asian cultures, how do North American Grade 1 students perform?

A) They perform much worse, and the difference in performance becomes more pronounced by Grade 5.
B) They perform at the same level, but by Grade 5 North American students are generally performing at a lower level.
C) They perform at a higher level, and the difference in performance becomes more pronounced by Grade 5.
D) They perform much worse, but by Grade 5 differences in performance are no longer evident.