Profit center responsibility reporting for a service company following quarterly income and expense accounts were provided from the trial balance as of December 31 : The following additional information has been gathered: 1. Prepare quarterly income statements showing operating income for the three regions. Use three column headings: North, South, and West. Do not round your interim calculations. 2. What is the profit margin of each region? Round to one decimal place. Identify the most successful region according to the profit margin. 3. What would you include in a recommendation to the CEO for a better method for evaluating the performance of the regions? a. The method used to evaluate the performance of the regions should be reevaluated. b. A better regional performance measure would be the return on investment (operating income divided by regional assets). c. A better regional performance measure would be the residual income (operating income less a minimal return on regional assets). d. None of these choices would be included. e. All of these choices (a, b \& c) would be included