Use of Real GDP to Measure Changes in National Output

Multiple Choice

Use of real GDP to measure changes in national output from one period to another can be misleading if

A) the price level is different for the two periods.
B) the share of production carried out in the nonmarket sector is different for the two periods.
C) the bundle of goods produced during the periods is quite similar.
D) the size of the export-import sector differs for the two periods.