The correct option is Dhokra metal casting.
Explanation
The Ghadwa community is a traditional tribal group residing primarily in the Bastar region of Chhattisgarh. They are historically and culturally renowned for their expertise in Dhokra metal casting, a form of bell metal craft.
- Dhokra metal casting is Correct: The Ghadwa artisans utilize the lost-wax casting technique (cire perdue) to create intricate metal artifacts. The term 'Ghadwa' is derived from the root 'Ghalna', which means to melt and shape. This craft is characterized by its rustic appearance and the use of coiled wax threads to create distinct surface designs before casting.
- Pata Chitra scroll painting is Incorrect: Pata Chitra is a traditional form of scroll painting known for its intricate details and mythological narratives, primarily associated with the states of Odisha and West Bengal.
- Terracotta votive figures is Incorrect: While terracotta art is prevalent in Bastar, it is traditionally associated with the Kumhar (potter) community. The Ghadwas are specifically metalworkers.
- Warli wall painting is Incorrect: Warli painting is a tribal art form utilizing geometric shapes, indigenous to the Sahyadri range in Maharashtra.
Key Takeaway: The Ghadwa community of Bastar is synonymous with Dhokra art, which employs the ancient lost-wax technique to produce bell metal handicrafts.