The correct answer is (a) Budihal.
Budihal is a Neolithic site located in the Raichur district of Karnataka, India. It is one of the largest and most important Neolithic sites in the Deccan. The site is known for its ash mounds, which are thought to be the remains of cooking fires. The ash mounds are also associated with a number of other artifacts, including pottery, stone tools, and animal bones.
The ash mounds at Budihal are thought to have been formed by the repeated burning of animal dung and other organic materials. The fires would have been used for cooking, as well as for heating and lighting. The ash from the fires would have been deposited on the ground, and over time, it would have built up to form the mounds.
The ash mounds at Budihal are an important archaeological site because they provide evidence of the Neolithic lifestyle in the Deccan. The mounds show that the people who lived at Budihal were skilled farmers and herders. They also show that they had a sophisticated understanding of fire and its uses.
The other options are incorrect because they are not associated with ash mounds. Sangan Kaliu is a Chalcolithic site, Koidihvva is a Mesolithic site, and Brahmgiri is an Iron Age site.