Transposons and retrotransposons differ because transposons move with the help of a DNA intermediate and retrotransposons move with the help of an RNA intermediate. So the correct option is B.
Retrotransposons are an extremely unique and notable group of transposons or transposable elements. They constitute large percentages of the genomes of most eukaryotes.
Retrotransposons demonstrate a “copy and paste” mechanism for their functioning. This is because they generate a new copy and leave behind the original copy. They insert the new copy somewhere else in the genome.
Through this process insertion of repetitive sequences of DNA occurs throughout the genome. This is the mechanism that is responsible for a wide spread of the transposable elements in so many higher organisms.
Therefore the correct option is B.
Read more about retrotransposons, here
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