Explanation:
The excuse given by rag pickers for not wearing chappals is all of the above options - mothers don't give, no interest, and a tradition. Let's understand each of these reasons in detail:

Mothers don't give: Many rag pickers come from poor families where the parents struggle to make ends meet. In such families, buying footwear is not a priority, and parents may not see the need to spend money on something as basic as chappals. As a result, children may not receive chappals from their mothers.

No interest: Some rag pickers may not find it necessary to wear chappals as they are used to walking barefoot. They may feel that chappals hinder their movement or are uncomfortable to wear. As a result, they may not show any interest in wearing chappals.

A tradition: In some communities, it may be a tradition to not wear footwear while working in the fields or doing manual labor. This tradition may have been passed down through generations and followed by the rag pickers as well.

Conclusion:
In conclusion, rag pickers may give a variety of reasons for not wearing chappals, including a lack of interest, financial constraints, or cultural traditions. However, it is important to note that not wearing footwear can expose them to various health risks and infections, and efforts should be made to provide them with basic protective gear like chappals.