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 lower on the SAT than they did a generation ago.
B) Americans today score higher on the SAT than they did a generation ago.
C) Performance on the Raven's Matrices test reveals that Americans have lower IQs today than they did a generation ago.
D) "Culture-bound" IQ tests have shown increases in American intelligence over the past generation, but "culture-free" IQ tests have not shown any changes.
E) IQ increased among Americans in the first half of the twentieth century but has been decreasing since then.