Which action allows changes to a file to be sent to the central repository in a version control system?

The action that allows changes to a file to be sent to the central repository in a version control system is best represented by the process of committing. When you commit, you are essentially taking a snapshot of your changes and preparing to save them to the central repository, along with a message describing what changes have been made. This process signifies that the modifications are ready for integration into the central codebase.

In version control terminology, committing refers specifically to saving changes to the local repository, capturing the current state of your files. This is a crucial step before pushing updates to the central repository, which is typically the next action after a commit, where changes are sent to be shared with others.

Other potential options would involve different stages of the version control workflow. Pushing refers to sending committed changes from your local repository to the central repository, while checking in can be synonymous with committing but is more commonly used in certain version control systems. Syncing often refers to the process of updating your local files to match the central repository, which can involve pulling down new changes or synchronizing branches. Each of these actions plays a distinct role in version control, with committing being the specific action that directly relates to sending changes to a central repository.