The correct answer is: a) Krishna and Godavari river basins.
The Krishna and Godavari river basins are two of the most important river basins in India. They are located in the southern part of the country and are home to a large number of people. The Krishna River is the second longest river in India, while the Godavari River is the third longest. Both rivers are important sources of water for irrigation, drinking, and hydroelectric power.
The Nagarjuna Sagar and Srisailam dams are two of the largest dams in India. They are located on the Krishna and Godavari rivers, respectively. The Nagarjuna Sagar Dam is the largest dam in India by volume, while the Srisailam Dam is the second largest. Both dams are important for irrigation and hydroelectric power.
The Krishna and Godavari river basins are home to a large number of agricultural areas. The Nagarjuna Sagar and Srisailam dams provide water to these agricultural areas, which helps to support the livelihoods of millions of people.
The other options are incorrect because they do not accurately describe the location of the Krishna and Godavari river basins. The coastal plains are located in the eastern part of India, while the Rayalaseema region is located in the southern part of India. The Eastern Ghats are a mountain range located in the eastern part of India.