These are the only viruses large enough to be seen under the light microscope:
a) papillomavirus
b) poxvirus
c) herpes virus
d) adenovirus

B) Poxvirus

Explanation:

Poxviruses, a type of DNA-viruses, typically infect animal cells. They are particular big among viruses, with sizes ranging from 200 to 400nm. Their extremely large size (considering they are viruses) allow them to be visualized under light microscope.

b. read the phase at the intersection of any given temperature and pressure.