Hello. I am struggling with an Accounting question (multiple choice):

A firm's net income is $630,000 on sales of $63 million. Average assets for the period were $14 million. For the year:

a) margin was 6%, turnover was 1.5, and ROI was 6%.

b) margin was 5%, turnover was 1.2, and ROI was 6%.

c) margin was 1%, turnover was 4.5, and ROI was 4.5%.

d) margin was 4%, turnover was 1.2, and ROI was 4.8%.

Any help in the right direction would be greatly appreciated. Thank you.