I think the correct answer from the choices listed above is option C. The correct format would be:
According to John Smith, the most common error in solving math questions "relates to the order of operations (9)."
For MLA format, quotations are enclosed within double quotation marks, the author is provided and the specific page. It should be noted that there should be no period after the parenthetical citation.
You begin with the largest to the smallest. First revise the overall structure. make sure you have introductory paragraph, followed by supporting paragraphs. then summary and closing paragraphs.
After the paragraphs are correct then you can go in and revise sentences that do not belong. either reword or remove.
The final step is the words. making sure they are spelled and used correctly