What is the difference between a prima facie duty and a duty proper?

Question

Quizplus · Accepted Answer

Prima facie duties are moral duties that are binding unless they conflict with another moral duty. In other words, they can be overridden by a stronger moral duty. On the other hand, duties proper are moral duties that cannot be overridden by any other moral duty. Therefore, the best choice is A, which correctly states that prima facie duties can be overridden, but duties proper cannot.

What Is the Difference Between a Prima Facie Duty and a Duty