Answer:
The correct answer is letter "D": firms prefer debt to equity when external financing is required.
Step-by-step explanation:
According to the Pecking Order Theory, managers rely on three sources from where to obtain resources at the moment of investing. The order they select to choose between one or another is retained earnings, debt, and equity financing at last. This approach was spread by American Economy Professor Stewart Myers (born in 1940) and Chilean consultant Nicolas Majluf (born in 1945).
Therefore, debt is preferred to equity at the moment of financing the company's projects.