Which of the following three statements about ratios is correct?

I. The price to earnings ratio (P/E ratio) relates the prices a company charges for its products to the company's earnings.

II. The relative proportion of total equity in its capital structure can be determined if the firm's Debt Ratio is known.

III. If I know a firm's Net Profit Margin and Total Asset Turnover, I can determine its Return on Total Assets.

Select one:

a. One is true

b. Two are true

c. All are true.

d. All are false.