According to Pratibha, the answer that is not fair is option A, which refers to "The different rules". Let's delve into the explanation of this answer in detail.

Different Rules:
- Pratibha believes that having different rules for different people or groups is not fair. It implies that some individuals or groups have advantages or disadvantages based on the rules that apply to them.
- When different rules are in place, it creates an unfair playing field, where some may have more opportunities or privileges while others are restricted or disadvantaged.
- It goes against the principle of equality and fairness, as everyone should be treated equally and given the same opportunities.

Same Rules:
- On the other hand, Pratibha suggests that having the same rules for everyone is fair. This means that regardless of gender, age, or any other factor, everyone should abide by the same set of rules.
- When the same rules apply, it ensures that everyone is on an equal footing and has an equal chance to succeed or participate.
- It promotes inclusivity, equality, and fair competition.

Playing in Ground:
- Pratibha does not mention that playing in the ground is unfair. In fact, playing in the ground is an essential aspect of sports and recreation for individuals of all ages.
- Playing in the ground provides an opportunity for physical activity, skill development, teamwork, and healthy competition.
- It is important to ensure that everyone, regardless of gender or any other factor, has the opportunity to play in the ground and enjoy the benefits associated with it.

Girls and Boys Playing Together:
- Pratibha does not mention that girls and boys playing together is unfair. On the contrary, it promotes gender equality and inclusivity.
- Allowing girls and boys to play together encourages cooperation, understanding, and breaking gender stereotypes.
- It provides an environment where everyone can learn and grow together, fostering positive relationships and promoting equality.

Overall, Pratibha emphasizes that having different rules is not fair, while the same rules, playing in the ground, and girls and boys playing together are not considered unfair.