The correct option is B Reovirus Reovirus belongs to the group of ribonucleic acid viruses constituting the family Reoviridae. The genomes of viruses in Reoviridae contain 10–12 segments of double stranded RNA which are grouped into three categories based on their size which are L (large), M (medium) and S (small). Cauliflower mosaic virus contains double stranded DNA molecule. TMV is a single stranded RNA virus. ϕ×174 is a single stranded DNA virus.