The correct answer is C) interpret.
The other options of the question were A) ceremonial. B) execute. D) enforce.
To interpret means to explain the meaning of, or to clarify the definition of.
When someone is interpreting something, what he/she is doing is to elaborate on an answer. He/she is offering a full explanation of the subject at hand. The person can explain, give examples or clarify the meaning of something so there would be no doubt about it.