The correct answer is - 251 to 500.
The Ganges River basin is one of the most densely populated areas in the world. The average population density of this area is 390 people per square kilometer. The reason for the high density of the population in this area is that the Ganges River basin has been providing good living conditions for the people for thousands of years. The area has the Ganges River, as well as numerous other rivers, very fertile soil, nice climate, thus it has always been a very popular place for living in the Indian subcontinent. As it has been a densely populated area ever since people started living there, the trend continued over the centuries, and the population was constantly increasing. Numerous large cities have been built, and the region has been developing intensely in the past several decades, resulting in even more people being attracted to this area, thus contributing further to the high population density.
