The feature you can use to merge proposed changes in a repository on GitHub is Pull requests.
Pull requests are a core feature of GitHub, allowing developers to propose changes to a codebase, review code, discuss the changes, and eventually merge them into the main branch.
This collaborative workflow ensures that code is reviewed and vetted before becoming part of the project.

InnerSource is a software development methodology where an organization applies open-source best practices to build its own proprietary software within the safety of the company firewall.
In a GitHub Enterprise environment, this means instead of isolating code inside strict team silos, developers across different departments can view, fork, and contribute to each other's code repositories.
Reference:
https://github.com/resources/articles/innersource

GitHub Desktop provides a comprehensive graphical user interface (GUI) that abstracts away command-line complexities to help you manage local Git repositories seamlessly.
GitHub Desktop is a local software application used to manage code on your computer, whereas GitHub.com is a cloud-based platform used to host, share, and collaborate on that code. Think of GitHub Desktop as the local vehicle you use to build and package your work, and GitHub.com as the central, global train station where everyone meets to combine and dispatch their projects.
Reference:
https://dev.classmethod.jp/articles/exploring-git-github-and-github-desktop/

GitHub Mobile provides a streamlined experience for managing your GitHub notifications and participating in discussions, but it does not offer full functionality compared to the desktop or web interface.
Managing Notifications:
Option E is correct because GitHub Mobile allows users to manage notifications, keeping them up to date with their repositories, issues, pull requests, and other activities on GitHub.

GitHub Teams, as part of GitHub's paid plans, offers additional features and capabilities compared to GitHub Free, particularly for organizations.
GitHub Teams Benefits:
Option B is correct because GitHub Teams provides advanced security features like SAML single sign- on for secure authentication, as well as increased minutes for running GitHub Actions, which are essential for continuous integration and deployment workflows.