The correct answer is: a) Fertile agricultural land.
The coastal plains of Andhra Pradesh are known for their fertile agricultural land. The region is home to a number of major rivers, including the Godavari, Krishna, and Pennar, which provide water for irrigation. The soil in the coastal plains is also rich in nutrients, making it ideal for growing a variety of crops.
Option b) is incorrect because the coastal plains of Andhra Pradesh do not have dense forests. The region is home to a number of forests, but they are not as dense as the forests in other parts of India.
Option c) is incorrect because the coastal plains of Andhra Pradesh do not have significant mineral deposits. There are some mineral deposits in the region, but they are not as large or as important as the mineral deposits in other parts of India.
Option d) is incorrect because the coastal plains of Andhra Pradesh do not have hilly terrain. The region is relatively flat, with a few small hills.