The Shares of GDP Taken in Taxes by Federal, State

The shares of GDP taken in taxes by federal, state & local governments

A) have risen steadily in the past 40 years to about 22 percent.
B) have dropped steadily in the past 40 years to about 6 or 7 percent.
C) grew substantially until the early 1970s and have leveled off at about 10 to 11 percent.
D) fell steadily until the early 1970s and has risen steadily since then.