Why Is There No Universal Phylogenetic Tree Joining All Viruses

Why is there no universal phylogenetic tree joining all viruses, like those that exist for other organisms?

A) Because viruses are not organisms
B) Many viruses remain uncharacterised, meaning not enough data has been collated to produce such a tree
C) Because the diseases they cause are so varied, they are difficult to classify
D) There is no single gene shared by all viruses
E) Many viruses do not have dsDNA genomes, therefore very few have true genes from which to build a phylogenetic tree

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