The answer to this question is C. most people want to live close to the Himalaya Mountains. The northeastern part of India is located near the Himalaya Mountains, which are known for their beauty, natural resources, and cultural significance. Many people are drawn to this region due to its pleasant climate, abundant water resources, and opportunities for adventure and tourism. As a result, there is a higher population density in this area compared to other regions in India. The other options, such as pollution, the Ganges River, or religious conflicts, do not directly contribute to the high population density in the northeastern part of India.