3. the purpose of
is to review your work one final time to make sure it's error-free.
a. proofreading
b. drafting
c. editing
od. revising

The purpose of  proofreading is to review your work one final time to make sure it's error-free.

Explanation:

The proofreading involves the careful reading of the text by an expert, during which grammatical, stylistic and spelling errors are identified and corrected. It is focused on finding errors and making them into correct words or sentences.

It is very important to review your work due to finding all possible mistakes and be careful to correct them on time. Sometimes, you need someone to look over your work because you have read it multiple times and need someone who does not see it and is expert in grammatical, stylistic and spelling errors.

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.