The correct option is B Collenchyma
Hypodermis is not a dead part of the plant, and hence cannot be made up sclerenchyma. However, since the main role of hypodermis is to provide mechanical support, collenchyma is the only kind of cell that could be its main constituent. Collenchyma is has small amount of lignification on the cell wall that makes it rigid enough to provide mechanical support to the plant.