According to Research, Which of the Following Could at Least

According to research, which of the following could at least partially explain why children at East Asian schools tend to do better at math than children at American schools?

A) East Asian children start learning math before kindergarten.
B) East Asian students, on average, have a larger left brain hemisphere than American children.
C) East Asian students, on average, have a larger right brain hemisphere than American children.
D) East Asian teachers tend to use more concrete examples when teaching math than American teachers.
E) East Asian children's television programs have more math content than American children's television programs.