The author could be considered unbiased in her treatment of this topic because she bases her information on

The author could be considered unbiased in her treatment because she writes from a general perspective and rather than detailing just one side, she describes both sides of the story.

She bases her information off facts rather than opinion.

can you add the article

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.