Answer:
A chromosomes is B. A strand of DNA.
Step-by-step explanation:
The entire chain of DNA along with the group of stabilizing proteins is called as chromosomes. It is made up of chromatin fibers.
Chromosomes are ordinarily seen under a light magnifying instrument just when the cell is experiencing the metaphase of cell division. It has two long arms separated by dot like structure called as centromeres. It act has host of DNA which is considered as genetic material. This DNA in turn is comprised of bases joined together by hydrogen bonds.