Which of the Following Statements Describes a Virus

Which of the following statements describes a virus?

A) A microscopic organism that lacks nuclei and other organised cell structures
B) A microscopic organism that lives on or in another organism and benefits by deriving its nutrients at the host's expense
C) A multinucleated microscopic organisms with single stranded RNA and reverse transcriptase
D) A microscopic organism that cannot replicate or express its genes without a living cell
E) A nucleated microscopic organisms with double-stranded DNA and reverse transcriptase