Answer: 
The issue of the lack of fresh drinking water in developing nations is most related to overpopulation. 
Step-by-step explanation: 
- The lack of fresh drinking water is not only due to its rapid depletion, but is also related to the growing pollution of fresh drinking water with growing pollution. 
- The population growth in most developing countries is unregulated. Moreover, water management mechanisms are also not much sound. 
- Lately, overpopulation of developing nations has resulted in severe water scarcities in such countries. 
- Countries like India and Bangladesh can be looked at as an example of the same.