The correct answer is: a) Ancient history and archaeology.
Amaravati is a Buddhist archaeological site located on the banks of the Krishna River in Andhra Pradesh, India. The site was once the capital of the Satavahana dynasty, and it is home to a number of important Buddhist monuments, including the Great Stupa, which is one of the largest stupas in India. The ruins at Amaravati are a major attraction for those interested in ancient history and archaeology.
Option b) is incorrect because Amaravati is not a major attraction for those interested in wildlife and birdwatching. There are other sites in India that are better suited for these activities.
Option c) is incorrect because Amaravati is not a major attraction for those interested in adventure sports. There are other sites in India that are better suited for these activities.
Option d) is incorrect because Amaravati is not a major attraction for those interested in modern architecture. The ruins at Amaravati are ancient, and they do not represent modern architecture.