which diagram shows the phase right before cytokinesis?

Brief Explanations:

Cytokinesis is the final step of cell - division. The phase right before it is telophase. In telophase, the nuclear envelope reforms around the separated sets of chromosomes. Among the cell - division stages shown, the stage with the nuclear envelope starting to reform around the chromosomes (indicating the end of mitosis and just before cytokinesis) needs to be identified.

Answer:

The diagram showing the re - formation of the nuclear envelope around the separated chromosomes is the one right before cytokinesis. Without specific labels on the diagrams, it's not possible to precisely point out which of the four given diagrams it is, but the key feature to look for is the nuclear envelope reforming around the chromosomes at opposite poles of the cell.