The Share of Americans Who Pay No Personal Income Tax

The share of Americans who pay no personal income tax

A) has been relatively constant at approximately 33 percent throughout 1975-2009.
B) was relatively constant near 33 percent between 1975 and 2000, but it has increased during the past decade, reaching nearly half of adult Americans in 2009.
C) was relatively constant near 33 percent between 1975 and 2000, but it has fallen during the past decade, receding to only 18 percent in 2009.
D) rose steadily from 18 percent in 1975 to nearly 50 percent of adult Americans in 2000, but it receded to less than 40 percent in 2009.