The Table Below Shows National Income and Imports

Multiple Choice

The table below shows national income and imports.The level of exports is fixed at $300.All figures (in table and questions) are in millions of dollars.
TABLE 22-1
-Refer to Table 22-1.What are the correct values for the level of net exports (a,b,c,and d) at each level of national income?

A) a = $150,b = $50,c = -$50,d = -$150
B) a = -$150,b = -$50,c = $50,d = $150
C) a = $150,b = $250,c = $350,d = $450
D) a = $300,b = $300,c = $300,d = $300
E) not enough data to determine