The correct option is A Cocos
Cocos nucifera, the coconut palm, is a monocot perennial member of the Arecaceae, cultivated in tropical areas worldwide for its fruit and fiber. Coir, the fiber from the husk of the coconut is used in ropes, mats, door mats, brushes, sacks, caulking for boats, and as stuffing fiber for mattresses. It is used in horticulture in potting compost, especially in orchid mix. Thus, option A is correct. Corchorus, Clematis and Crotalaria are dicot plants. Thus, other options are wrong.