An Infection in an Abrasion Affecting Only the Epidermis of the Skin

An infection in an abrasion affecting only the epidermis of the skin is unlikely to spread systemically to other sites because

A) The micro environment of the epidermis is unfavorable for microbial growth
B) The dermis beneath secretes antimicrobial substances that contain the infection
C) There is availability of blood in this layer of the skin
D) There is no availability of blood in this layer of the skin