Which of the following best describes the change in federal government spending, in nominal dollars, since 1960?

Select the correct answer below:
a)Federal spending as a percentage of GDP has increased every year.
b)Federal spending as a percentage of GDP has decreased.
c)Federal spending as a percentage of GDP has had a fluctuating range, growing in some years but decreasing in others.
d)Federal spending as a percentage of GDP has remained the same.