Answer:
B. Defense Spending
Explanation:
In government term, Discretionary spending refers to parts of government spending that is considered as 'optional' , and required the appropriations of bill in order to be implemented.
Around 2/3 government of Government is considered as 'essential'. This amount cannot be allocated to the Discretionary spending since it accounted for social programs that must be given to the citizens of Untied States.
The remaining 1/3 can be allocated to the Discretionary spending. From this portion, Defense spending took up the largest percentage (15% of the Discretionary spending). Defense spending pay off our soldiers, purchasing military's equipment's, investing in military's research/development, etc.
