Fibers may occur in almost any part of a plant: stems, leaves, fruits, seeds, etc. The four main types grouped according to their origin include bast fibers, wood fibers, sclerenchyma cells associated with the vascular bundle strands in leaves and surface fibers that are hair like outgrowths on the seeds of the plants. It might be preferable to designate those fibers that occur in the outer parts of the stem as cortical fibers, pericyclic fibers or phloem fibers.
Bast fibre or skin fibre is plant fibre collected from the phloem or bast surrounding the stem of certain, mainly dicotyledonous plants. They support the conductive cells of the phloem and provide strength to the stem. Fibres also can be obtained from epidermis. Thus, option D is correct.
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