Chloroplasts are organelles found in the cells of plants and of some other organisms that carry out photosynthesis. They contain their own genetic material, separated from the DNA found in the nucleus of the cell. The DNA in chloroplasts has a distinct structure and form.

The DNA within chloroplasts is mostly:

- Circular: The DNA forms a closed loop, similar to the DNA found in bacteria. This similarity supports the endosymbiotic theory, which proposes that chloroplasts originated as free-living prokaryotes that were engulfed by ancestral eukaryotic cells.

- Double-stranded: Like most DNA, the DNA in chloroplasts is made up of two complementary strands that wind around each other to form a double helix.

Based on this information, the correct answer to your query about the form of DNA present in chloroplasts is:

Option B: Circular, double stranded