The site showcasing a series of prehistoric cave paintings:

Badami
Chandravalli
Piklihal
Hampi

The correct answer is: C) Piklihal

Piklihal is a prehistoric site located in the Raichur district of Karnataka, India. It is known for its series of cave paintings, which date back to the Mesolithic period. The paintings depict a variety of scenes, including hunting, dancing, and religious ceremonies.

Badami is a UNESCO World Heritage Site located in the Bagalkot district of Karnataka, India. It is known for its series of rock-cut temples, which were built in the 6th and 7th centuries CE. The temples are dedicated to the Hindu gods Shiva, Vishnu, and Lakshmi.

Chandravalli is an archaeological site located in the Bellary district of Karnataka, India. It is known for its series of megalithic burials, which date back to the Iron Age. The burials are surrounded by stone circles and contain a variety of grave goods, including pottery, weapons, and ornaments.

Hampi is a UNESCO World Heritage Site located in the Bellary district of Karnataka, India. It was the capital of the Vijayanagara Empire from the 14th to the 16th centuries CE. Hampi is known for its ruins of temples, palaces, and other buildings.