Concept:DNA is the genetic material that is organized and packaged inside the nucleus of cells.Explanation:In eukaryotic cells, DNA is tightly wrapped around proteins and folded into structures called chromosomes.Chromosomes protect the DNA and help control gene activity.They are found in the nucleus and become visible during cell division.Ribosomes make proteins, blood transports materials, and enzymes speed up reactions, so none of these carry the main genetic information.Answer:B. chromosomes