During mitosis, the primary focus is on the replication and distribution of chromosomes (DNA) to ensure that each daughter cell receives an identical set of genetic material. While other cellular components, such as cytoplasm, organelles, and proteins, are also involved in the process, they do not specifically replicate during mitosis as chromosomes do.
If you are specifically looking for what is replicated during mitosis, the answer would be cells, as the entire cell undergoes division resulting in two identical daughter cells. However, if the question is strictly about replication, it is the chromosomes that are accurately distributed, although they are replicated during the earlier phase of the cell cycle (S phase, before mitosis begins).
For clarity, if the choices provided were looking for what specifically replicates, it would be chromosomes during the S phase, but out of the given options, cells would be the correct response, as mitosis results in the formation of two daughter cells.