The correct option is C Hypodermis of monocot stem
Pith, mesophyll and epidermis are made up of parenchyma cells. Hypodermis of monocot stem is made up of sclerenchyma cells.
Hence the odd one out of these would be hypodermis of monocot stem.
Pith is the central most region of roots and stems.
The mesophyll is the ground tissue found in leaves that helps in photosynthesis.
The epidermis forms the outer layer of roots, stems and leaves and is made up of parenchyma cells.