Which of the Following Is TRUE About Cultural Change in the United

Which of the following is TRUE about cultural change in the United States?

A) Americans today score higher on the SAT than they did a generation ago.
B) All IQ tests reveal trends that Americans have higher IQs today than they did a generation ago.
C) "Culture-bound" IQ tests have shown increases in American intelligence over the past generation,but "culture-free" IQ tests have not shown any changes.
D) IQ increased among Americans in the first half of the 20th century,but has been decreasing since.
E) None of the statements are true.