Which operating system is best suited for modifying its source code due to its open-source nature?

The best option for modifying its source code due to its open-source nature is Linux. Linux is a widely-used open-source operating system, which means that its source code is freely accessible to anyone. This allows developers and users to study, modify, and distribute the software.

The open-source nature of Linux contributes to its flexibility and adaptability, making it suitable for various applications ranging from personal computers to servers and embedded systems. Additionally, a robust community and numerous distributions of Linux further enhance its customizability, enabling users to tailor the system to their specific needs.

In contrast, Windows and macOS are proprietary operating systems, meaning that their source code is not available for public modification. While Unix has a long history and various open-source variants exist, it is primarily associated with specific systems and may not be as widely accessible or modifiable as Linux. Therefore, Linux stands out as the operating system that facilitates modification and personalization due to its open-source licensing and active development community.