Which aspect of a text is least likely to contribute to its theme

A. The reading level

B. The conflict

C. The characters

D. The setting

I think your answer would be B

I would say A. The reading level.

The conflict contributes because a theme is the subject of talk or main idea behind the story.

Characters would contribute.

Obviously the setting contributes.

So the only one that doesn't make sense to me is A. The reading level