The correct option is B Conjoint, collateral and open
In each vascular bundle of dicot stem, the xylem and phloem elements are in the same line; the presence of one to few stripped intra-fascicular cambium is found in between xylem and phloem; the cambial cells are thin walled; phloem is external to xylem; the protoxylem is nearest to centre. Hence, it can be said that the vascular bundles are conjoint, collateral, endarch, open and wedge shaped.