18. In 2018 Foxglove Co. had fixed operating costs of $500,000 and a variable operating cost percentage of 68%. In 2019 sales and fixed operating costs were unchanged from the previous year, but the company was able to lower its variable operating cost percentage to 58%. Which of the following is most correct? O a. the company's total asset turnover ratio decreased in 2019 ob. the company's operating profit margin increased in 2019 O c. the company's fixed assenturnover ratio increased in 2019 O d. the company was less risky in 2019 due to lower operating leverage O e. both a and d are correct