The Baltimore classification of viral genomes is based on Choose one: A. whether the virus is enveloped. B. the composition of the genome. C. the type of organism the virus infects. D. the shape of the viral capsid.

The correct answer is option B. "the composition of the genome".

Explanation:

The Baltimore classification of viral genomes is based on the composition of the virus' genome and its method of replication. It was developed by David Baltimore, who made families of viruses depending if its genome was comprised of DNA, RNA, or if it was single-stranded or double-stranded. Additionally, the Baltimore classification systems takes into account if the virus replicates in a positive strand (sense) or in a negative strand (antisense). There is a total of seven groups in the Baltimore system of viral genomes.