It should be principles since principals would be the head of a school and if you add an apostrophe then it is showing possession.
There are several guiding principles that an ethical person must follow. Hence, option A is correct.
Principles help us comprehend the world around us, the people around us, and ourselves. They help us understand why and how things happen. Therefore, the type of content we should cover in the majority of our training is probably principles.
Entropy in several domains, least action in physics, those in descriptive, broad, and foundation law, as well as doctrines or preconceptions constituting normative code of behaviour, are examples of principles.
Thus, option A is correct.
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