The correct answer is: a) East Godavari
East Godavari district is the most populous district in Andhra Pradesh, India. It has a population density of 1,000 people per square kilometer. The district is located in the coastal region of Andhra Pradesh, and is known for its fertile land and agricultural production. The district is also home to a number of important historical and cultural sites, including the ancient city of Amaravati.
The other options are incorrect because they have lower population densities than East Godavari district. Guntur district has a population density of 800 people per square kilometer, Krishna district has a population density of 700 people per square kilometer, and Visakhapatnam district has a population density of 600 people per square kilometer.
East Godavari district is the most populous district in Andhra Pradesh because it has a number of factors that make it attractive to people. The district has a fertile land, which is ideal for agriculture. The district is also located in the coastal region, which provides access to the sea. The district is also home to a number of important historical and cultural sites, which makes it a popular tourist destination.