Which of the Following Is an Implication for the Strategist

Which of the following is an implication for the strategist in the context of corporate governance and a company's success?

A) Very few and specific corporate-governance mechanisms can be effective in addressing the principal-agent problem.
B) Effective corporate governance and solid business ethics are critical to gaining and sustaining competitive advantage.
C) Leading by ethical example often has a less strong effect on employee behavior than words.
D) A firm that restricts its responsiveness to stockholders (and no other stakeholders) and keeps them committed to its vision will be successful.