The correct option is C Xylem and phloem are radial.
Diagnostic features of a dicot root - In a dicot root, vascular bundles are described as radial and tetrarch as they are arranged in a ring. There are four bundles each of xylem and phloem occurring alternately. Xylem is described as exarch. Presence of thin walled cells in the epiblema. Absence of cuticle, and stomata. Presence of unicellular root hairs. Absence of hypodermis. Presence of passage cells and Casparian thickenings in the endodermis. Presence of uniseriate pericycle made up of parenchyma. Presence of conjuctive tissue. Absence of pith.
Thus, the correct answer is option C.