The correct answer is: A. embroidery
Chhanak is a type of embroidery that is done on the borders of clothes, especially saris. It is a traditional art form that is found in the Indian subcontinent. Chhanak is made by using a needle and thread to create intricate patterns on the fabric. The patterns are usually geometric or floral in design. Chhanak is often used to decorate wedding clothes and other special occasions.
Option B, art, is incorrect because chhanak is not a general term for art. It is a specific type of embroidery.
Option C, headgear, is incorrect because chhanak is not a type of headgear. It is a type of embroidery.
Option D, song, is incorrect because chhanak is not a type of song. It is a type of embroidery.
I hope this helps! Let me know if you have any other questions.