The correct option is B. Stephanie should write down the main ideas, key points, details, and other important information on the left-hand column. The Cornell Notes method involves dividing a page into two columns, with the main ideas, key points, and important information written on the left-hand column, and supporting details and explanations written on the right-hand column. After taking notes, Stephanie should review her notes and write a summary in the box at the bottom of the page. This method allows for effective review and retention of information.