When would the "return on equity" equal to the "the return on assets"?

Assume that total assets are equal to $100 and net income is not equal to zero. a. whenever (TOTAL EQUITY divided by TOTAL ASSETS) is equal to .5 b. whenever (TOTAL LIABILITIES divided by TOTAL ASSETS) is equal to 0 c. whenever the firm has positive net income d. whenever the TOTAL DEBT RATIO is equal to 1 e. whenever (TOTAL EQUITY divided by TOTAL ASSETS) is equal to 0