In the Nation of Economia, the Economy Is Overheating and There

In the nation of Economia, the economy is overheating and there is danger of inflation. The chief economist estimates that current income is $50 billion, the optimal level is $40 billion, and the multiplier is 4. If government wants to close the inflationary gap, it should reduce government spending by

A) $2.5 billion.
B) $7.5 billion.
C) $10 billion.
D) $40 billion.