Riboviruses and Retroviruses both are RNA containing viruses.
They differ from each other in
Riboviruses show RNA -> RNA synthesis
Retroviruses show RNA -> DNA synthesis by reverse transcription
Both (1) and (2) are correct
All are wrong
RNA viruses are viruses that have a single-stranded or double-stranded RNA as their genetic material, while retroviruses are viruses that have a single-stranded RNA as their genetic material but use DNA intermediates in their life cycle.
Therefore, option 2 is correct.