In which stage of the writing process do you polish your writing by correcting errors in grammar, spelling, and mechanics?

a. drafting

b. editing and proofreading

c. revising

d. prewriting

The correct answer is B, editing and proofreading. The word "proofread" literally means to scan the document in search for mistakes in grammar, spelling, etc. When you're "drafting", you're not thinking about those things, the most important thing is to think of a subject to write about. Proofreading is very important when it comes to these things.