Which of the following could be an indicator of improper sanitation?

The presence of waste near crops is a clear indicator of improper sanitation. When waste accumulates in agricultural areas, it can lead to various health hazards, including contamination of soil and water sources. This contamination can result in the introduction of pathogens that may affect crop safety and human health. Proper sanitation practices are essential to prevent the contamination of crops and to maintain the overall health of the farming environment.

In contrast, a pleasant smell in the field typically indicates a well-managed area with proper waste decomposition, while the health of the workers and abundant crop growth can suggest positive sanitation practices. Therefore, the proximity of waste to crops serves as a direct signal of potential sanitation issues that need to be addressed.