The Tax Elasticity for the Federal Government of the United

The tax elasticity for the federal government of the United States over the past 20 years was roughly equal to

A) 1.8; that is, a 1 percent increase in GDP generated a 1.8 percent increase in tax revenue.
B) -1.8; that is, a 1 percent reduction in GDP causes tax revenues to climb by 1.8 percent.
C) 1.8; that is, a 1.8 percent increase in GDP could be expected to generate a 1 percent decrease in tax revenue.
D) .55; that is, a 0.55 percent increase in tax revenue could be expected if GDP increased by 1 percent.
E) none of the above.