The Table Below Shows Real GDP,potential GDP and the Unemployment

Multiple Choice

The table below shows real GDP,potential GDP and the unemployment rate for a hypothetical economy.
TABLE 30-3
-Refer to Table 30-3.The variations in the unemployment rate between 2007 and 2015 are likely due to variations in

A) the NAIRU.
B) frictional unemployment.
C) structural unemployment.
D) potential output.
E) the output gap.