The correct answer is E. Poxvirus. 

The image shows Molluscum Contagiosum. The causative virus is the poxvirus, a DNA virus. Poxvirus is also the causative agent for smallpox, orf, and milker’s nodule.

Herpesvirus is associated with herpes simplex (HSV), varicella-zoster (VZV), cytomegalovirus (CMV), and Epstein-Barr (EBV), Adenovirus has several serotypes but is not the most common causative agent of molluscum contagiousum, Papillomavirus is associated with human papillomavirus (HPV); Parvovirus is associated with human parvovirus B19.

References: General Dermatology 2.2 Infectious Diseases of the Skin DIR Review book page 99