The correct answer is Kamrup Metro.
Kamrup Metro is the most populous district in Assam, with a population density of 2,366 people per square kilometer. It is located in the central part of the state and is home to the city of Guwahati, the capital of Assam. The district is also home to a number of other important towns and cities, including Dibrugarh, Jorhat, and Tinsukia.
Barpeta is the second most populous district in Assam, with a population density of 1,285 people per square kilometer. It is located in the central part of the state and is home to the city of Barpeta. The district is also home to a number of other important towns and cities, including Goalpara, Dhubri, and Kokrajhar.
Nagaon is the third most populous district in Assam, with a population density of 1,102 people per square kilometer. It is located in the central part of the state and is home to the city of Nagaon. The district is also home to a number of other important towns and cities, including Jorhat, Golaghat, and Sibsagar.
Dhubri is the fourth most populous district in Assam, with a population density of 868 people per square kilometer. It is located in the western part of the state and is home to the city of Dhubri. The district is also home to a number of other important towns and cities, including Goalpara, Kokrajhar, and Bongaigaon.
The population density of a district is the number of people living in that district per square kilometer. It is a measure of how crowded a district is. The population density of a district can be affected by a number of factors, including the size of the district, the availability of resources, and the economic activity in the district.