Understanding the Role of Physical Education
Physical education (PE) plays a crucial role in developing not just physical skills but also essential social qualities. Among the options provided, cooperation stands out as the most significant outcome of physical education.

Importance of Cooperation in Physical Education
- **Teamwork Development**: PE often involves team sports and group activities that require students to work together towards a common goal. This fosters a sense of unity and collaboration.
- **Social Skills Enhancement**: Through cooperative games and sports, students learn how to communicate effectively, resolve conflicts, and understand the importance of supporting one another.
- **Building Trust**: Engaging in group activities helps students build trust among peers. They learn to rely on each other's strengths and contribute to the team's success.

Contrast with Other Options
- **Anger**: While competitive environments can sometimes lead to frustration, physical education aims to channel this energy positively rather than fostering anger.
- **Revenge**: PE promotes sportsmanship and fair play, discouraging revengeful attitudes that can arise from competition.
- **Fear**: The focus on cooperation helps reduce fear of failure or judgment, creating a supportive atmosphere where students feel safe to participate.

Conclusion
In summary, physical education is a vital component of holistic development in students. It emphasizes cooperation, teaching valuable life skills that extend beyond the classroom and into everyday interactions. This is why option 'D'—cooperation—is the correct answer.