an increase in which of the following will increase the return on equity, all else constant ?

1. total asset turnover 2. net income 3. total assets 4. debt-equity ratio

a. 1 only b. 1 and 2 only c. 1, 2 and 4 only d. 1, 2 and 3 only e. 1, 2, 3, and 4