Answer:
A. They make the dialogue lively and humorous.
Step-by-step explanation:
In these lines, we see that Alice has a conversation with the Queen of Hearts about the Cheshire cat. This conversation switches often from one speaker to the other one, and they both express themselves in very short sentences and using few words. The effect of this structure is that it makes the dialogue lively, and humorous. This is emphasized by the fact that the dialogue is silly and often nonsensical.