The correct option is B Silk
Silk is a natural protein fibre, some forms of which can be woven into textiles. The protein fibre of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. A wide range of plants, including cotton, kapok, jute, flax, ramie, sisal, and hemp, may be used to produce plant fibre and many fibre plants are grown as field crops to make paper, cloth, and rope.