The correct answer is West Champaran.
West Champaran is a district in the Indian state of Bihar. It is known for its tradition of bamboo craft. Bamboo is a versatile material that can be used to make a variety of products, including furniture, baskets, and mats. The bamboo craft industry in West Champaran is a major source of employment for the local population.
Gaya is a district in the Indian state of Bihar. It is not known for its tradition of bamboo craft.
Rohtas is a district in the Indian state of Bihar. It is not known for its tradition of bamboo craft.
Khagaria is a district in the Indian state of Bihar. It is not known for its tradition of bamboo craft.