The correct option is B Coir
Coir is a natural fibre extracted from the husk of coconut and used in products such as floor mats, doormats, brushes, mattresses, etc. Coir is the fibrous material found between the hard, internal shell and the outer coat of a coconut which is mesocarp. Other uses of brown coir (made from ripe coconut) are in upholstery padding, sacking and horticulture. Thus, option B is correct.