The correct answer is: a) Godavari and Krishna river basins.
The Godavari and Krishna river basins are the two major river basins in Andhra Pradesh. These river basins are prone to floods due to their high rainfall and the presence of many tributaries. The Godavari river basin is the largest river basin in Andhra Pradesh, covering an area of about 100,000 square kilometers. The Krishna river basin is the second largest river basin in Andhra Pradesh, covering an area of about 70,000 square kilometers.
The Godavari and Krishna river basins are important for agriculture and irrigation. However, they are also prone to floods. The floods in these river basins can cause extensive damage to crops, infrastructure, and human life.
The Rayalaseema region is a semi-arid region in Andhra Pradesh. It is not prone to floods. The Coastal districts are also not prone to floods. The Hill districts are located in the north-eastern part of Andhra Pradesh. They are also not prone to floods.
In conclusion, the correct answer is: a) Godavari and Krishna river basins.