If your goal is to determine how effectively a firm is managing its assets, which of thte following sets of ratios would you examine?

a. profit margin, current ratio, fixed charge coverage ratio
b. quick ratio, debt ratio, time interest earned
c. inventory turnover ratio, days sales outstanding, fixed asset turnover ratio
d. total assets turnover ratio, price earnings ratio, return on total assets
e. time interest earned, profit margin, fixed asset turnover ratio