Which of the Following Is Correct

Which of the following is correct?

A) If a relatively poor country had grown at 3.5 percent per year for the last 100 years, it would be a relatively rich country today.
B) International data on the history of the growth of real GDP per person shows that the rich countries get richer and the poor countries get poorer.
C) In the United States, average income today is about four times as high as average income a century ago.
D) All of the above are correct.