Which feature in Google Docs allows for real-time collaboration?

Google Docs offers a robust platform for real-time collaboration, and all features listed contribute to this collaborative experience. The ability to edit documents simultaneously allows multiple users to make changes and see those changes reflected instantly. This is primarily facilitated through real-time editing.

Version History allows users to track changes made to a document over time and see who made specific alterations. While this is important for collaboration, it does not support real-time interaction in the way that simultaneous editing does.

Commenting enhances collaboration by enabling users to leave feedback or ask questions directly on the document. This feature encourages discussion and can lead to more effective teamwork, though it doesn't provide the immediate collaborative editing experience.

Chat is another feature that allows collaborators to communicate while working on a document. This direct line of communication can be invaluable for discussing changes or resolving issues as they arise, further enhancing real-time collaboration.

By including all these features, Google Docs creates a comprehensive environment that allows users to work together seamlessly, making option D the most accurate representation of how real-time collaboration is supported in the platform.