A 38-year-old female undergoes removal of a 2 x 1-cm skin lesion shown to be a melanoma. It is reported as Clark level 1, which implies what?

(A) It is superficial to the basement membrane.
(B) It is 1 mm in thickness.
(C) It has nodal involvement.
(D) It involves the papillary layer.
(E) It involves the reticular dermis.
Correct answer: A