All of the Following Are Reasons for Classifying Viruses in the Three

Multiple Choice

All of the following are reasons for classifying viruses in the three domains and not in a fourth domain except

A) Viruses direct anabolic pathways of host cells.
B) Viruses are not composed of cells.
C) Some viruses can incorporate their genome into a host's genome.
D) Viruses are obligate parasites.
E) None of the above.