The correct answer is: b) Buses.
Buses are the main mode of public transport within Andhra Pradesh cities. They are a convenient and affordable way to get around, and they serve a wide range of destinations. Buses are also a good option for people who want to avoid traffic congestion.
Metro Rail is a relatively new mode of public transport in Andhra Pradesh, and it is not yet as widespread as buses. However, Metro Rail is a fast and efficient way to get around, and it is likely to become more popular in the future.
Taxis are a convenient way to get around, but they can be expensive. They are also not always available, especially during peak hours.
Auto rickshaws are a popular mode of public transport in Andhra Pradesh, but they can be dangerous. They are also not always comfortable, and they can be difficult to get into and out of.
In conclusion, buses are the main mode of public transport within Andhra Pradesh cities. They are a convenient and affordable way to get around, and they serve a wide range of destinations. Buses are also a good option for people who want to avoid traffic congestion.