Characterization is a description of qualities or peculiarities: a list of places of interest, with brief characterizations of each. Representation of a character or characters on the stage or in writing, especially by imitating or describing actions, gestures, or speeches.
I think the correct answer from the choices listed above is option C. Communication is considered ethical if it is relevant to the topic of discussion. Good communication is the use of the proper words for the given topic. Hope this answers the question.