Among the given options, the state of Arunachal Pradesh in India has the lowest density of population. Arunachal Pradesh is located in the northeastern part of India and is known for its rugged and mountainous terrain, dense forests, and diverse tribal communities. Here are some reasons why Arunachal Pradesh has the lowest population density:

1. Geographical Features: Arunachal Pradesh is characterized by its challenging topography, with a significant portion of the state covered by the Eastern Himalayas. The state is home to numerous peaks, valleys, and rivers, making it difficult for large-scale human habitation. The mountainous terrain restricts the availability of arable land and limits the scope for settlement, leading to a sparser population.

2. Inaccessibility: Arunachal Pradesh is relatively remote and inaccessible compared to other states in India. It shares borders with Bhutan, Tibet (China), and Myanmar, with a large portion of its boundaries being defined by natural features such as mountains and rivers. The lack of good transportation infrastructure, including roads and railways, hinders easy movement and connectivity, further limiting the influx of people into the state.

3. Tribal Diversity: Arunachal Pradesh is known for its rich cultural heritage and diverse tribal communities. The state is home to more than 25 major tribes and numerous sub-tribes, each with its distinct languages, customs, and traditions. Tribal populations often prefer to maintain their traditional way of life, which includes living in smaller settlements and practicing subsistence agriculture. This preference for traditional lifestyles contributes to the lower population density in the state.

4. Ecological Importance: Arunachal Pradesh boasts exceptional biodiversity and is considered one of the world`s biodiversity hotspots. The state`s vast forest cover includes diverse ecosystems, including tropical rainforests and alpine meadows. Conservation efforts to protect the unique flora and fauna, including various endangered species, restrict large-scale human settlement and contribute to the lower population density.

It`s worth mentioning that the density of population in a state can change over time due to various factors, such as migration, infrastructure development, and government policies. Therefore, it is essential to refer to the latest data from reliable sources for precise population density figures.