Final answer:
The deepest layer of the epidermis that a splinter would penetrate to on your foot is the stratum basale, which attaches to the basal lamina and contains the epidermal stem cells that produce keratinocytes.
Step-by-step explanation:
If a splinter penetrates to the deepest layer of the epidermis on your foot, this layer is the stratum basale. The stratum basale is the innermost epidermal layer and attaches the epidermis to the basal lamina, with the dermis below.
It contains stem cells responsible for the production of keratinocytes, and it bonds to the dermis via intertwining collagen fibers known as the basement membrane. The correct answer to the question is A) stratum basale.