There Are a Number of Small DNA Viruses That Are

There are a number of small DNA viruses that are highly dependent on their host cells for transcription and replication enzymes.Which of the following could explain the evolutionary origins of these viruses?

A) They originated from fragments of the genomes of larger more independent viruses.
B) They originated from intracellular plasmids found in bacteria.
C) They originated from the genomes of intracellular organelles, such as mitochondria.
D) They originated from fragments of cellular DNA that broke away from the cell genome.
E) All of the above could be correct.