How can a teacher view contributions made by several students in one collaborative Google Doc?

The correct answer involves utilizing the revision history feature within Google Docs, which enables a teacher to view contributions made by each student in a collaborative document. Each student's edits are color-coded, allowing for easy identification of who made specific changes. This feature provides a clear timeline of document evolution, illustrating not just what was changed, but also pinning those changes to the respective contributors.

By contrast, checking document settings pertains more to permissions and access rather than tracking contributions. Sending the document for feedback does not specifically track or display who made what changes within the text itself. Reviewing the comments section focuses on feedback and suggestions made by users but does not provide a comprehensive view of edits made to the document's content. Hence, the revision history stands out as the most effective method for a teacher to assess collaborative contributions comprehensively.