Biopsy from a mole on the left foot shows cytologic atypia of melanocytes and diffuse epidermal infiltration by anaplastic cells,which are also present in the papillary and reticular dermis.The most possible diagnosis is:

• A. Dysplastic nevus
• B. Melanova,clark level III
• C. Melanoma,clark level IV
• D. Congenital melanocytic nevus