The correct option is A Single stranded
A plasmid is a small, circular, double-stranded extra chromosomal DNA. It is found in bacterial cell and in some eukaryotes also. Often, the genes carried in plasmids provide bacteria with genetic advantages, such as antibiotic resistance.
A plasmid is an independent, circular, self-replicating DNA molecule that carries only a few genes.
Hence, thw correct answer is "option C"