The correct answer is B. HPV 7. 

The photo depicts verruca vulgaris. HPV 2 and 7 are most likely to cause Butcher’s warts. HPV 3 and 10 are most likely to cause flat warts. HPV 13 and 32 are most likely to cause oral focal epithelial hyperplasia (Heck’s disease).

References:

James WD, Berger TG, Elston DM, Neuhaus IM. Andrews’ Diseases of the Skin: Clinical Dermatology, 12th ed. Philadelphia, PA: Elsevier; 2016.