Final answer:
Group VI viruses contain ssRNA genomes and use reverse transcriptase to convert their RNA into DNA before integrating it into the host genome.
Step-by-step explanation:
The student's question relates to viruses and their methods of replication, specifically focusing on which group of viruses contains ssRNA and uses reverse transcriptase. Upon reviewing the provided content, the correct answer to the question is D) Group VI. Group VI viruses have diploid ssRNA genomes and use the enzyme reverse transcriptase to convert this ssRNA into double-stranded DNA (dsDNA), which is then integrated into the host cell's genome. Subsequently, mRNA is produced by transcription of the viral DNA. This is a characteristic of retroviruses, which are members of Group VI according to the Baltimore classification system.