Answer:
C. Dialogue
Step-by-step explanation:
An elegy is a poem of serious reflection, typically a lament for the dead. Therefore it cannot be the answer as it is not addressed to an audience.
A soliloquy is an act of speaking one's thoughts aloud when by oneself or regardless of any hearers, especially by a character in a play. This is not the answer because they aren't necessarily meant to be overheard by an audience.
Dialogue is a conversation between two or more people as a feature of a book, play, or movie.
A monologue is a long speech by one actor in a play or movie, or as part of a theatrical or broadcast program. This is typically done towards the viewer of the media, rather than another character in the media, and is, ultimately, incorrect.