Answer:
Option D
Explanation:
From the calculation of natural unemployment rate, it is the addition of frictional rate and structural rate , then divided by total labor force. it does nit include cyclical unemployment rate.
Options that have cyclical unemployment rate is wrong, because it does not involve cyclical rate., it is not always 2% or less of civilian labor force because it is not all cases. , and it is not structural rate because from the formula is it the combination of structural and frictional divided by total labor force. this makes options D the rate answer.