The correct answer is C. 1.0cm.

The recommendation for a margin excision for in situ melanomas is 0.5cm (not including lentigo maligna forms). Margin excision for a melanoma up to 1mm in thickness is 1.0cm. Thickness between 1.01-2mm requires a 1-2cm surgical margin, and >2cm is needed when the tumor thickness reaches 2mm.

References: 

Garbe C, Bauer J. Melanoma. In: Bologna J, ed. Dermatology. Philadelphia: Elsevier Saunders; 2012: 1885-1914.

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