Which file types cannot be reviewed by Grammarly for Education?

Grammarly for Education has specific limitations on the types of file formats it can process and review for grammar and writing assistance. PDF files and Microsoft PowerPoint presentations are among those formats that cannot be directly analyzed by Grammarly.

The reason for this is largely tied to the structure of these file types. PDFs, for example, are meant to preserve the layout of a document across different platforms, which makes it challenging for text extraction and grammar checking. Similarly, PowerPoint presentations often contain text elements embedded in slides, which complicates the analysis process that Grammarly performs.

In contrast, text-based formats like .txt, .odt, .docx, and .rtf support straightforward text editing and are compatible with Grammarly's tools for grammar checking and writing enhancement. Therefore, option C is correct as it identifies the file types that are not supported for review in the Grammarly for Education platform.