A major portion of Andhra Pradesh lies on the:

Deccan Plateau
Indo-Gangetic Plain
Thar Desert
Coastal Plains

The correct answer is (a) Deccan Plateau.

The Deccan Plateau is a large plateau in the southern part of India. It is a vast, undulating plain with an average elevation of about 1,000 meters (3,300 feet). The plateau is made up of a series of plateaus and hills, and is drained by a number of rivers, including the Godavari, Krishna, and Cauvery.

The Deccan Plateau is a major agricultural region, and is also home to a number of important cities, including Hyderabad, Bangalore, and Chennai.

The Indo-Gangetic Plain is a large plain in the northern part of India. It is a fertile plain that is home to a large number of people. The plain is drained by the Ganges River, which is the longest river in India.

The Thar Desert is a desert in the northwestern part of India. It is a hot, dry desert that is home to a number of different animals, including camels, snakes, and lizards.

The Coastal Plains are a narrow strip of land along the coast of India. The plains are fertile and are home to a number of different crops, including rice, sugarcane, and cotton.