Contractor would plan strategies for fighting against a gang.

Explanation:
Fighting against a gang requires careful planning and strategic thinking in order to ensure the safety and success of the operation. A contractor, who is a professional hired to carry out specific tasks, would be responsible for developing effective strategies to combat a gang. Here's a detailed explanation of why the answer is option 'C':

1. Introduction:
- A contractor is someone who is hired to execute a specific task or project.
- Planning strategies is an essential part of a contractor's role to achieve desired outcomes.

2. Passing the Examination:
- Planning strategies for passing an examination is not a task typically associated with a contractor.
- Passing an examination depends on individual effort, study habits, and preparation.

3. Cheating in the Examination:
- Cheating in an examination is unethical and against the principles of fair play.
- A contractor, as a professional, should promote honesty and integrity in their work.
- Planning strategies to cheat goes against these principles and is not a suitable role for a contractor.

4. Playing Cricket:
- Playing cricket is a recreational activity and does not require the involvement of a contractor.
- Strategies in cricket are typically developed by coaches and captains, not contractors.

5. Fighting Against a Gang:
- Fighting against a gang involves dealing with criminal or antisocial elements.
- A contractor can be involved in planning strategies to combat a gang, especially in scenarios like security consulting or law enforcement projects.
- Strategies may include gathering intelligence, coordinating with law enforcement agencies, implementing preventive measures, and ensuring the safety of individuals and communities affected by gang activities.

Conclusion:
In conclusion, the most appropriate option for a contractor to plan strategies is fighting against a gang. This task aligns with the responsibilities and expertise of a contractor in areas such as security consulting or law enforcement projects. Planning strategies to pass an examination, cheat in an examination, or play cricket are not typical roles for a contractor.