Correct option (a) Dracaena
Explanation
Secondary growth in monocotyledons is rather rare, it is commonly seen in woody monocotyledons such as Dracaena, Alae, Agave, etc. In Dracaena sp exceptionally large secondary growth in throkness occurs that begins with the formation of secondary meristematic tissue--the cambium, in the parenchyma outside the primary bundles. Moreover, cork in Dracaera appears in seriated bands without the formation of cork canrbium (phellogen) and is known as storied cork.
