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Common ancestry and continuing evolution

Problem

The following table lists evolution rate estimates for a set of viruses. The evolution rates are measured as the number of base-pair substitutions per nucleotide site in the virus genome, per year (s/n/y).
Virus nameEvolution rate (s/n/y)
Norwalk virus4, point, 97 x 10, start superscript, minus, 3, end superscript
SARS coronavirus2, point, 82 x 10, start superscript, minus, 3, end superscript
Human rotavirus A1, point, 66 x 10, start superscript, minus, 3, end superscript
West Nile virus0, point, 85 x 10, start superscript, minus, 3, end superscript
Human hepatitis B virus0, point, 43 x 10, start superscript, minus, 3, end superscript
Human adenovirus B0, point, 07 x 10, start superscript, minus, 3, end superscript
Which of the following claims is best supported by the data in the table?
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