The correct option is D both a and b
A layer of cells presents below the epidermis is called the hypodermis. The hypodermis is the outermost region of the cortex.
In the monocot stem, the hypodermis is made up of sclerenchyma cells. The vascular bundles in the monocot stem are surrounded by sclerenchymatous bundle sheath. It is called the bundle sheath. So sclerenchyma is present in both hypodermis and bundle sheath.
The ground tissue in the monocot stem is large, homogenous, and is made of parenchymatous cells.