Choice "A" is correct. Frictional unemployment is the unemployment that arises from workers routinely changing jobs or from workers being temporarily laid off. It results from the time needed to match qualified job seekers with available jobs.
Choice "b" is incorrect. A mismatch between worker skills and available employment is an example of structural unemployment.
Choice "c" is incorrect. Fluctuations in seasonal demand for employees is an example of seasonal unemployment.
Choice "d" is incorrect. Recessions are low points in economic cycles that create cyclical unemployment.
