The correct option is C Phloem
Bast fibre is the fibre generally found in the phloem of dicot plants. It is also known as skin fibre. These support the stem and also helps the conductive cells of the phloem in their function. Most of the technically important bast fibres are obtained from herbs cultivated in agriculture, as for instance flax, hemp or ramie etc. So, bast fibres are obtained from phloem and not from cork, cortex and xylem. Thus, option D is correct.