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

The table below shows real GDP, potential GDP and the unemployment rate for a hypothetical economy. TABLE 31- 1
-Refer to Table 31- 1. What is the NAIRU in this economy?

A) 7.0%
B) 6.2%
C) 5.9%
D) 6.4%
E) 6.1%