Answer: A. Stratum corneum
Explanation:
Stratum corneum is the outermost layer of the skin epidermis. It is composed of dead cells and protein keratin. This is the thickest layer of the skin. It is also called as the horney layer. It forms a barrier between the body and the surrounding environment. It provides protection to inner skin layers.
On the footpad the strateum corneum forms a thick layer of the foot which provides protection from injury.
