The correct option is
C Reoviruses
Arbovirus is a term used to refer to a group of viruses that are transmitted by arthropod vectors. Symptoms of arbovirus infection generally occur 315 days after exposure to the virus and last 3 or 4 days. The most common clinical features of infection are fever, headache and malaise, but encephalitis and hemorrhagic fever may also occur. Double stranded RNA viruses are not known as arboviruses. Thus, option A is wrong.
Reovirus, any of a group of ribonucleic acid (RNA) viruses constituting the family Reoviridae, a small group of animal and plant viruses. The virions of reoviruses lack an outer envelope, appear spheroidal, measure about 70 nanometres across, have two icosahedral capsids and contain a core of segmented, double-stranded RNA. Double stranded RNA viruses are known as reoviruses. Thus, option C is correct.
The term riboviruses encompasses viruses with single- and double-stranded RNA genomes. Thus, option B is wrong.
Ribovira are RNA viruses which contains either single stranded or double stranded RNA. Thus, option D is wrong.
Thus, the correct answer is option C.