Can somebody help please

Answer:
The answer is supposed to be dialogue.
Explanation:
You know how characters sometimes say weird words like, "ain't", like a word we don't use in everyday language? That's dialogue. And the question specifically asks for "words that move the plot forward". It wouldn't be plot.
The answer is dialogue (A) because dialogue is a "written or spoken conversational exchange between two or more people, and a literary and theatrical form that depicts such an exchange."