Answer:
So Option A has the highest return on common stockholders equity which is 17.8%
Step-by-step explanation:
First we will calculate the return on each each stockholder equity by using the following formula:
Return=(Net Income-preferred dividends)/Average common stockholder equity
Part A:

Return=17.8%
Part B:

Return=7.9%
Part C:

Return=7.7%
Part D:

Return=7.3%
So Option A has the highest return on common stockholders equity which is 17.8%