Correct Answer: (c) Silk
Solution:In Gupta and later Gupta period, the word 'Kausheya' was used to denote silk. The word kausheya comes from the Sanskrit word kosh, which means "cocoon of a silkworm". The ancient Sanskrit grammarian Pāṇini is credited with deriving the word. The Gupta period was a time of great artistic, architectural, and religious developments in South Asia, from around 320-647 C.E. The Guptas exported luxury products like silk, leather goods, fur, iron products, ivory, pearl, and pepper.