Answer: D. A bacterial plasmid with a target gene inside it best describes Recombinant DNA.
Explanation: Recombinant DNA is formed by inserting a target gene of interest into a plasmid, which is a circular piece of DNA that can replicate independently in a bacterial cell. This results in a bacterial plasmid with the target gene inside it. The recombinant DNA can then be used for various purposes such as producing proteins, testing gene function, and more.