Answer:
Option B,
Step-by-step explanation:
Plasmids resembles the shape and size of a small circular DNA strand that lies with in the the cytoplasm of a bacterium or protozoan. Thus option B is the correct answer
They are different from normal cell's chromosomal DNA and usually exists naturally in bacterial cells and some Eukaryotas. They have the ability to replicate independently of the chromosome and thus are mainly used in laboratory for experiments involving gene manipulation
Hence, option B is correct