What most likely explains why the author uses expressions like growled balled his fists. and straightened to look larger describe characters?

The author uses expressions like "growled", "balled his fists", and "straightened to look larger" to describe characters in a way that conveys their emotions, intentions, and physical presence.

Here's a breakdown of how these expressions work:

* "Growled": This suggests anger, aggression, or a forceful tone of voice. It immediately paints a picture of a character who is not to be trifled with.

* "Balled his fists": This action is often associated with aggression and readiness for a fight. It further reinforces the character's tense and potentially hostile state.

* "Straightened to look larger": This conveys a sense of dominance and intimidation. The character is consciously trying to appear bigger and more imposing, perhaps to gain an advantage or to scare someone else.

By using these vivid and specific descriptions, the author helps the reader visualize the character's feelings and intentions. This creates a more engaging and impactful reading experience.