Answer: A) Dialogue.
Explanation: Characterization is a literary device that is used to highlight and explain the details about a character in a story. There are many different methods of characterization, one of them being the use of dialogue. Dialogue, or a conversation between two or more people, can tell the reader a lot about characters' personalities, for example, the character's feelings and thoughts through the tone of voice, the character's background through his accent, or mention of places, etc.