Keratinocytes are the primary cell type in the epidermis and make up the vast majority of epidermal cells.
Studies generally agree that keratinocytes account for around 90% to 95% of all epidermal cells.
Therefore, statements (A) and (C) are within the accepted range.
Statements (B), (D), and (E) underestimate the percentage or provide less common figures.
So, the correct answer is A and C only.