In the revision process, you should focus on the proofreading. The correct option is D.
What is proofreading?
Proofreading is the final examine of any text, it is the examination of the grammar, punctuation, spellings and accuracy.
It is the last step of checking the text if it is ready to or valid to go online or published in a book or other magazines or research papers.
Thus, the correct option is D, proofreading,
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