Option c is the correct answer. The term 'Kausheya' has been used for silk in ancient Indian literature, such as the Vedas, the Ramayana, the Mahabharata, and the Arthashastra. The term 'Kausheya' is derived from the Sanskrit word 'Kosa', which means 'cocoon'. Silk was considered as a precious and luxurious fabric, which was worn by the royalty, nobility, and priests. Sushruta samhita mentions it as 'articles of bandaging'.