According to Steven Johnson,which of the Following Is a Contributor

According to Steven Johnson,which of the following is a contributor to people's growing intelligence?

A) Intelligence is not growing-SAT scores have actually been decreasing.
B) The modern world requires more learning and practice with demanding problem-solving tasks than before.
C) More involvement in sports leads to increased brain efficiency.
D) Increased complexity is inherent in modern pop culture.
E) Intelligence is not growing-IQ tests are not culture-free,and takers are merely becoming more aware of their culture.