1) If C is consumption, I is investment, G is government purchases and NX is net exports, 
according to the expenditure approach, Y would stand for ________; and the national income 
identity could be written as ________. 
A) transfers; Y = C + I + G - NX 
B) CPI; Y = C + I + G + NX 
C) GDP; Y - C - I = G + NX 
D) income; Y = C - I - G + NX 
E) the real interest rate; Y = C + I + G + NX