Both of them go on place to another
This is a complete sentence.
There's nothing wrong with this pronoun agreement because nothing needs to be changed. It's a trick question.
The correct answer is d-It affects the tone of the story, which affects how theme is communicated.
Syntax use varies on style and genre, not diction, while it is not connected to the plot itself since it is a metalingual aspect.
I believe the answer is c.