Can someone teach me how to solve this type of problem? I understand operating income and sales margin, but not capital turnover... Thank you in advance!

Golden Corporation has operating income of $336,000, a sales margin of 16%, and capital turnover of 3.0. The return on investment (ROI) for Golden Corporation may be closest to:

A. 2%

B. 5% (known to be incorrect)

C. 48%

D. 160%