The correct option is B plasmid
Plasmids are extrachromosomal, small, circular double stranded DNA found in many bacteria. As it can replicate on its own it is also used as a vector for transferring the desired DNA into the suitable host.
Recombinant DNA (rDNA) is a modified DNA molecule that has genes or DNA fragments from multiple biological sources.
Nucleoid refers to the irregularly-shaped region in the prokaryotic cell where the genetic material is found.
Satellite DNA is the non-coding sequence of the DNA that has high tandem repeats.