Option a is the correct answer. The Ahar-Banas culture was a Chalcolithic culture that flourished in the Mewar region of Rajasthan, India, from about 3000 BC to 1500 BC . It is named after the sites of Ahar and Banas, where the first excavations of this culture were conducted by A. Ghosh in 1953. Statement A is correct: The Ahar civilization was known for its knowledge of metallurgy, including copper smelting. Statement B is incorrect: Rice was known to the Ahar civilization, and archaeological evidence suggests that they cultivated and consumed rice. Statement C is correct: Metalwork, including copper and other metal objects, played a significant role in the economy of the Ahar civilization. They knew copper smelting and metal work, producing tools, weapons, and ornaments from copper and its alloys such as bronze. Statement D is correct: Ahar civilization used black and red pottery with white geometrical designs, which is distinctive of this culture. They also made terracotta figurines of animals and humans.