Answer: Option A
Explanation: In simple words, budget deficit can be defined as the amount by which the expenditure of the Govt. is exceeding its revenue in a particular period.
Thus, one can lessen the deficit of Govt. either by increasing revenue or by decreasing its expenses. In the given case all other options In B, C and D will result in in crease in spending thus widening the deficit.
Hence, the right option is A.