Which of the following is not correct?
选项：

A:Frictional unemployment results from the process of matching workers and jobs.
B:Structural unemployment results when the number of jobs is insufficient for the number of workers.
C:Minimum wages are the predominant reason for unemployment in the U.S. economy.
D:When a minimum-wage law forces the wage to remain above the level that balances supply and demand, it raises the quantityof labor supplied and reduces the quantity of labor demanded compared to the equilibrium level.