Assume that the full-employment level of output is $1,000 and the price level associated with full-employment output is 100. Also assume that the economy's current level of output is $1,100 and at the price level of 100 current aggregate demand is $1,200. If the government moves the economy back to the full-employment level of output by increasing taxes by $50, then the expenditures multiplier equals:

A. 2.B. 5.C. 4.D. 10.