(C) The potato spindle tuber disease is caused by $Viroids$. $Viroids$ are infectious agents that are smaller than viruses and consist solely of a sho

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(C) The potato spindle tuber disease is caused by $Viroids$. $Viroids$ are infectious agents that are smaller than viruses and consist solely of a short strand of circular,single-stranded $RNA$ without a protein coat. They were discovered by $T.O. Diener$ in $1971$. Therefore,the correct option is $C$.