The problem is that the spreadsheet's content is wider than the page's current width, causing columns to "spill" onto the next page. The most direct solution is to change the page orientation from the default Portrait (taller than it is wide) to Landscape (wider than it is tall). This provides more horizontal space, allowing all the columns to fit across a single page width. This resolves the layout issue while still allowing the user to print in duplex mode as requested.

A. Turning off duplex printing directly contradicts the user's requirement to "still print on both sides of the page."

B. Using a smaller font might work but could make the spreadsheet difficult to read, which is already a stated problem. It is a less optimal solution.

D. A print driver issue would typically cause printing errors, garbled text, or incorrect formatting, not a predictable content layout problem from the application.

1. Microsoft Corporation. (n.d.). Set page orientation to portrait or landscape in Excel. Microsoft Support. "If your worksheet has a lot of columns, you can switch the page orientation from portrait to landscape. 1. Select the worksheet or worksheets for which you want to change the orientation. 2. On the Page Layout tab, in the Page Setup group, click Orientation, and then click Landscape."

2. Cornell University, Center for Advanced Computing. (n.d.). Printing from Excel. Section: "Page Layout". "If you have a wide spreadsheet, you may want to print it in Landscape orientation. To change the orientation, click the Page Layout tab. In the Page Setup group, click Orientation and select Landscape."