Prior to an expanded child care subsidy program in Illinois, the labor force participation rate of single mothers in Illinois was 45% and in Wisconsin was 48%. After Illinois expanded its child care subsidy program, the participation rate increased to 58% in Illinois and to 51% in Wisconsin, The expanded child care program in Illinois is estimated to increase labor force participation of single mothers by how much according to a difference-in-differences estimator? A. 3% . 6% . 7% D. 10%