15. When does the double taxation problem faced by corporations exist? a. Whenever a corporation earns a profit, pays taxes on that profit, and then pays interest to its bondholders who are taxed. b. Whenever a corporation earns a profit, pays taxes on that profit, and then pays dividends to its stockholders who are taxed. c. Whenever a corporation eams a profit and pays taxes on that profit d. Whenever a corporation earns a profit, pays taxes on that profit, and then pays dividends to its shareholders who are not taxed