The one that is true of an agent's duty to a principal is option B. an agent owes a principal his or her best effort to complete all tasks no matter how difficult.
A Principal refers to the master, instructor, bureaucrat, headmistress, leader, chancellor, principal or highest authority in a given work setting with the greatest responsibility for the management of the establishment. In some English-speaking countries, the title for this role is principal officer.
Therefore, the correct answer is as given above
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