The correct option is C Phloem fibers
Bast fibre or skin fibre is plant fibre collected from the phloem (the "inner bark" or the skin) or bast surrounding the stem of certain, mainly dicotyledonous plants. They support the conductive cells of the phloem and provide strength to the stem. Natural bast Fibers are strong, cellulosic fibers obtained from the phloem or outer bark of jute, kenaf, flax and hemp plant. Jute fibres are bast fibres (phloem fibres). Thus, option C is correct.