Per Capita GDP in the US Between 1900 and 2011

Per capita GDP in the US between 1900 and 2011 _____.

A) has remained about the same.
B) increased until about 1970 and decreased since then.
C) was cyclical, but generally trending upward throughout the century.
D) grew very quickly for the first half of the century and grew at a much lower rate in the second half of the century.