Bidriware is a form of metal handicraft that originated in the state of Karnataka, making option C the correct answer. It is a unique and highly skilled craft that has gained recognition both nationally and internationally. Here is a detailed explanation of Bidriware:

Origin and History:
- Bidriware originated in the town of Bidar in the northern part of Karnataka.
- It has a rich history and is believed to have been introduced by the Bahmani Sultans in the 14th century.
- The craft was highly patronized during the rule of the Deccan Sultanates, especially the Adil Shahi dynasty.

Craftsmanship and Technique:
- Bidriware is known for its intricate designs and the use of a special metal alloy known as bidri.
- The metal used in bidriware is a combination of zinc and copper, with a small amount of lead.
- Skilled artisans create exquisite designs on the metal surface using chisels and other carving tools.
- The designs are then filled with a black paste made from soil and ammonium chloride, which gives bidriware its distinctive black color.
- The piece is then polished to bring out the silver inlay and give it a lustrous finish.

Distinctive Features:
- Bidriware is known for its unique combination of black and silver.
- The contrast between the black background and the intricate silver inlay designs is visually striking.
- The designs often depict intricate floral patterns, geometric motifs, and Persian-inspired designs.
- The craftsmanship and attention to detail make bidriware highly sought after by collectors and art enthusiasts.

Recognition and Significance:
- Bidriware has received the Geographical Indication (GI) tag, which recognizes its unique origin and traditional craftsmanship.
- It is also listed as one of the country's intangible cultural heritage by the Government of India.
- Bidriware has gained popularity not only in India but also internationally, with its products being exported to various countries.
- It is used to create a wide range of items such as vases, bowls, trays, jewelry, and decorative pieces.

Conclusion:
Bidriware is a form of metal handicraft that originated in the state of Karnataka. Its intricate designs, skilled craftsmanship, and unique combination of black and silver have made it highly coveted both in India and abroad. The recognition it has received through the GI tag and its inclusion as an intangible cultural heritage highlight its cultural and artistic significance.