West Bengal has a very high population density compared to the other given states.

Explanation:

Factors affecting population density:
Population density refers to the number of individuals per unit area. It is influenced by various factors including geographical features, climate, availability of resources, economic opportunities, and social factors.

1. Geographical features:
- West Bengal is located in the eastern part of India and has a relatively small land area compared to other states like Madhya Pradesh and Rajasthan.
- It is situated in the fertile Gangetic plain, which provides favorable conditions for agriculture and settlement.
- The state is also endowed with a network of rivers such as the Ganges, Brahmaputra, and Hooghly, which further support agricultural activities and human settlements.

2. Economic opportunities:
- West Bengal is known for its industrial and commercial activities, especially in cities like Kolkata, Howrah, and Durgapur.
- The state has a well-developed transportation infrastructure, including railways, roadways, and ports, which attract people from various regions for employment opportunities.
- Kolkata, the capital city of West Bengal, is a major economic and cultural hub, drawing migrants from different parts of the country.

3. Social factors:
- West Bengal has a rich cultural heritage and is known for its literary, artistic, and intellectual pursuits.
- The state has a high literacy rate and educational institutions that attract students from neighboring regions, leading to a higher concentration of people.
- It also has a diverse population with people from different communities and religions, contributing to its vibrant social fabric.

Conclusion:
Considering the above factors, West Bengal has a combination of favorable geographical features, economic opportunities, and social factors that contribute to its high population density compared to the other given states.