In modern versions of Microsoft Word (specifically since Word 2007), the default font size used for new documents is 11 points. This default is typically applied when you open a new blank document, usually with the 'Calibri' font. This combination was chosen to provide a clean, contemporary appearance for documents. While users can easily change the font size and style at any time within their document, or even modify the default template, 11 points remains the out-of-the-box setting that most users encounter when starting a new Word file.
Option B: 12 is incorrect. Although 12 points is a very common and highly readable font size, often preferred for academic papers and formal documents, it is not the default in recent versions of MS Word. Older versions of Word (e.g., Word 2003 and earlier) commonly defaulted to 10 or 12 points, often using Times New Roman.
Option C: 13 is incorrect. 13 points is not a standard default font size in MS Word. It is an unusual increment that users might manually select, but it has never been the factory-set default for main body text in any significant version of the software.
Option D: 10 is incorrect. 10 points is a smaller font size, which might be used for specific elements like footnotes, captions, or fine print in a document. However, it is not the default font size for the main body text in current versions of Microsoft Word. Using 10-point font for primary text is generally considered less readable for extended passages.