The Table Below Shows Government Purchases (G),net Tax Revenues (T),and

The table below shows government purchases (G) ,net tax revenues (T) ,and debt-service payments (iD) over a 4-year period for a hypothetical economy.All figures are in billions of dollars.Assume the stock of debt at the end of 2015 is $500 billion. TABLE 31-1 Refer to Table 31-1.What is the stock of debt at the end of 2018?

A) $494 billion
B) $500 billion
C) $506 billion
D) $528 billion
E) $552 billion