Which of the following is a free, cloud-based word processor that allows you to create, edit and collaborate in real-time with other users?

The correct choice is Google Docs, which is a free, cloud-based word processor. It enables users to create and edit documents directly in their web browser without the need for software installation. One of its most notable features is the ability to collaborate in real-time with other users. This means that multiple users can simultaneously work on the same document, seeing each other's changes instantly. This collaborative functionality is particularly beneficial for group projects, remote teams, and educational settings, where real-time feedback and interaction can enhance productivity and creativity.

In contrast, while Microsoft Word is a powerful word processor with collaboration features, it is not entirely free and typically requires a purchase or subscription. Adobe Acrobat is primarily designed for managing and editing PDF files rather than word processing, and LibreOffice Writer, though a free office suite application, operates locally on devices unless specific cloud capabilities are utilized. Thus, Google Docs stands out as the ideal answer for a fully free and cloud-based collaborative word processor.