Which One of the Following Statements Is a Reason for NOT

Multiple Choice

Which one of the following statements is a reason for NOT classifying viruses in one of the threedomains of life (Bacteria,Archaea,Eukarya) rather than in a fourth separate domain?

A) Some viruses can incorporate their genome into a host's genome.
B) Viruses direct anabolic pathways of host cells.
C) Viruses are obligate parasites.
D) Viruses are not composed of cells.