Where can a developer compare file differences when checking for merge conflicts?

The correct choice, pertaining to where a developer can compare file differences when checking for merge conflicts, is the Pull Request. When a developer creates a pull request, it serves as a request to merge one branch into another. This process inherently includes a comparison of changes between the two branches involved in the pull request. The platform displays the differences side-by-side, highlighting any conflicts that may arise due to changes that overlap in the same file or area.

The pull request interface not only allows developers to see these differences but also provides tools for discussion and collaboration, facilitating review and resolution of any identified merge conflicts. This helps ensure that all team members can contribute input before finalizing the merging process.

While the other options also have their significance in the version control ecosystem, they do not specifically focus on the context of comparing file differences during a merge conflict situation. For example, the Git Repository may provide file histories but lacks the contextual merging functionality. Similarly, the Deployment History relates to the status of deployments rather than the discrepancies between code versions. Finally, the Branch Comparison Tool, while useful for comparing branches in general, may not be as integrated into the collaborative review process as the pull request system is designed to be.