One of the Findings of Recent Labour Market Research Regarding

One of the findings of recent labour market research regarding unemployment is that:

A) cyclical unemployment is more stable than structural unemployment.
B) even in a well-functioning competitive economy, in which the number of workers equals the number of jobs, some workers can be jobless.
C) unemployment occurs primarily as a result of inefficient labour markets.
D) in a competitive economy, the equilibrium level of unemployment is the frictional rate of unemployment.
E) while there are a number of different types of unemployment, the primary source of unemployment is the business cycle.