19. In 2018 Azalea Co. had a ROE of 20%. In 2019, ROE fell to 18%. The following ratios were the same in 2018 and 2019: operating profit margin, total asset turnover, equity multiplier. Which of the following is most likely true? ha re a. DSO was higher in 2018 than 2019 O b. there was a significant increase in operating costs in 2019 O c. depreciation was higher in 2018 than 2019 O d. control of interest and tax expenses was worse in 2019 than in 2018