Answer:
Option C
Step-by-step explanation:
Comparing texts means you are trying to find similarities between two or more sources of information. Which means your answer is option C or "common." It's not option A because dialogue is a conversation between two or more characters in a story. It's not a margin because a margin is usually extra information of the story, perhaps background information on how the story was wrote. It's also not option D because a setting is where a story takes place.
Hope this helps.