I think it is b because it is a result of an environmental influence
Yes you can catch it sadly
<span>Basically, retrotransposons is transcribed
then reverse transcriptase produces a double-stranded DNA copy of the element
which is then inserted into the genome. In addition retrotransposons cont are
related to retroviruses that all carry pol and some contain gag. It is a none
encode env thus they can be reverse transcribed and inserted into host DNA but
are unable to produce viral particles. However a typical DNA transposon
transposed through consevative or replicative transposition. Thus these DNA
transposons are a group of transposable elements that can move in the DNA of an
organism via a single or double-stranded DNA intermediate. They have been found
in both prokaryotic and eukaryotic organisms. </span>
