The correct answer is: Guntur.
Guntur district has the highest population density in Andhra Pradesh, with a population of 3,234,015 and a population density of 1,003 persons per square kilometer.
East Godavari district is the second most populous district in Andhra Pradesh, with a population of 4,154,300 and a population density of 779 persons per square kilometer.
Chittoor district is the third most populous district in Andhra Pradesh, with a population of 3,144,200 and a population density of 441 persons per square kilometer.
Krishna district is the fourth most populous district in Andhra Pradesh, with a population of 3,094,100 and a population density of 855 persons per square kilometer.
The population density of a district is the number of people living in that district per square kilometer. It is calculated by dividing the population of the district by the area of the district. The population density of a district can be used to measure the level of urbanization in that district. A high population density indicates that a district is highly urbanized, while a low population density indicates that a district is less urbanized.