The correct option is C Silk < Cotton < Wool < Jute < Coir
Silk, extracted from silk worms is known for its very smooth texture and strength.
Silk, cotton and wool are used in the manufacture of clothes due to their smooth texture.
Jute and coir have extremely rough texture and are used in manufacture of door mats and bags.
The correct order of smoothness of the given textures is
Silk > Cotton > Wool > Jute > Coir