The correct answer is B. Duty of care. The CFE Manual states that the duty of care means people in a fiduciary relationship must act with the care that an ordinarily prudent person would employ in similar positions. It further explains that corporate officers, directors, high-level employees, and other fiduciaries must conduct business affairs prudently, using the skill and attention normally exercised by people in comparable roles.

This standard is different from the duty of loyalty, which focuses on faithfulness to the principal and avoiding self-dealing, kickbacks, undisclosed conflicts of interest, and other disloyal conduct. The duty of care instead addresses the quality of decision-making and oversight. Fiduciaries who act carelessly, recklessly, or without proper prudence can be held responsible for resulting losses, including losses tied to negligence, mismanagement, or waste of corporate assets.

The other options are not the correct doctrinal label used in the CFE Law materials. Because the question specifically describes acting with the skill and attention of an ordinarily prudent person in a similar position, it is describing the duty of care. Therefore, B is the correct answer.