The correct option is C Single stranded RNA
Rous sarcoma virus (RSV) is a retrovirus and is the first oncovirus to have been described. It causes sarcoma in chickens. RSV has a positive sense single-stranded RNA genome. RSV has reverse transcriptase enzyme which converts RNA into cDNA then this cDNA gets incorporated into host genome and causes sarcoma. So, the correct answer is 'Single stranded RNA'.