The correct answer is A) Brahmagiri.
Brahmagiri is an important Chalcolithic site in Karnataka. It is located in the Chitradurga district of Karnataka, India. The site is a UNESCO World Heritage Site.
Brahmagiri was first excavated in 1947 by H.D. Sankalia. The site has yielded evidence of human habitation from the Chalcolithic period to the early historic period. The Chalcolithic period at Brahmagiri is dated to 2000-1000 BCE. The site has yielded evidence of a well-developed culture with a strong agricultural base. The people of Brahmagiri were skilled in pottery, metalworking, and stone carving.
The site is also known for its megalithic burials. The megalithic burials at Brahmagiri are dated to the Iron Age. The burials are made up of large stone slabs that are arranged in a circle. The burials have yielded evidence of a rich material culture, including pottery, metal objects, and stone tools.
Brahmagiri is an important site for the study of the Chalcolithic and Iron Age cultures of Karnataka. The site has yielded a wealth of information about the people who lived in this region during these periods.
The other options are not important Chalcolithic sites in Karnataka.
Pattadakal is a UNESCO World Heritage Site located in the Bagalkot district of Karnataka, India. The site is known for its Hindu temples, which were built between the 7th and 8th centuries CE.
Aihole is a village in the Bagalkot district of Karnataka, India. The village is known for its early Chalukyan temples, which were built between the 6th and 8th centuries CE.
Halebidu is a town in the Hassan district of Karnataka, India. The town is known for its Hoysala temples, which were built between the 11th and 13th centuries CE.