Correct Answer:
A. Mos
The word "moral" is derived from the Latin word "Mos," which means custom or manner. Options B, C, and D are incorrect as they do not represent the etymological root of the word "moral."
The word "moral" is derived from the Latin word "Mos," which means custom or manner. Options B, C, and D are incorrect as they do not represent the etymological root of the word "moral."