Pith cavity occurs in the stem of Dracaena, Cucurbita, Zea mays, Helianthus?

In the centre of the stem is pith, in which the vascular bundles are embedded in its outer zone. The pith is made up of polygonal oval or rounded parenchyma cells which enclose intercellular spaces. The pith cells store food. In some dicots, the central part of the pith disintegrates to produce a cavity, called pith cavity, e.g., Cucurbita. So, the correct answer is option C.