Which of the following would be considered the firm's optimal capital structure? A. Stock Price = $24, Earnings Per Share = $12, Cost of Equity Capital = 17% OR B. Stock Price = $23, Earnings Per Share = $11, Cost of Equity Capital = 18% OR C. Stock Price = $25, Earnings Per Share = $10, Cost of Equity Capital = 15% OR D. Stock Price = $20, Earnings Per Share = $12, Cost of Equity Capital = 20%.