(? ) refers to the year-to-year fluctuations in unemployment around its natural rate, and it is closely associated with the sort-run ups and downs of economic activity. A.Frictional unemployment B.Cyclical unemployment C.GDP D.Sectoral shift

(? ) refers to the year-to-year fluctuations in unemployment around its natural rate, and it is closely associated with the sort-run ups and downs of economic activity. A.Frictional unemployment B.Cyclical unemployment C.GDP D.Sectoral shift

正确答案：B