The figure shows the unemployment rate from the first quarter in 1970 until the fourth quarter in 2017. Recessions are highlighted in the figure by the gray boxes. 12 -Recessionary -Recessionary period period (1980 11-1982 IV) 10 (1974 1- 1975 D) Recessionary period- Recessionary 8 (2001 1-2001 IID) period (2008 1-2009 ID) Unemployment rate (percentage points) 2 Recessionary period (1990 III-1991 D) 1970 1 1975 1 1980 1 1985 1 1990 1 1995 1 2000 1 2005 I 2010 1 2015 1 2017 IV Quarters MyLab Economics Real-time data According to the figure, during recessionary periods, the unemployment rate A. decreased O B. increased O C. remained unchanged O D. increased by the same amount in each recession