Suppose that in 2015, ABC Corporation produced $6 million worth of natural gas pipes but was able to sell only $5 million worth. Is the remaining $1 million of unsold pipes part of GDP for 2015?
A) No, since changes in inventories are part of actual investment.
B) No, since they are added to existing inventories.
C) Yes, since they are part of the economy's output in 2015.
D) NC since they are part of the economy's output only when sold.
E) Yes, since changes in inventories are part of consumption expenditures.