How does the reader know that this passage is written in the third-person point of view?

A reader can know if a passage is written in third-person limited point of view by finding signal words. Some signal words that show the passage is written in 3rd-person limited pov are they, he, and she. 3rd person limited is a passage told following one certain character.

Explanation:

They use pronouns like he, him, himself, and herself. In third person limited, you only use these on a specific character, but in third person omniscient, you follow everyone, and the reader has knowledge of everyone's actions.

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in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.