In which area does clean drinking water present the biggest problem? cities in ldcs polar regions tropical regions urban areas in mdcs

The correct answer is - cities in LDC's.

The cities in the LDC's (Least Developed Countries) are much different than the cities in the developed countries. They are not made with planning, the urbanization is on a very low level, the infrastructure is mostly lacking or is of very bad quality, and basic things for life of the people either are not there or only in limited amounts. One of the biggest problems is the drinking water because it is the essential thing that allows us to live, but in this type of cities it is very limited, on lots of places there isn't any, and very often it is not a water that is recommendable for drinking because it contains bacteria and pollutants.