Question

which diagram shows the phase right before anaphase?

Explanation:

In cell division, the phase right before anaphase is metaphase. In metaphase, chromosomes align at the cell's equatorial plane. The first diagram shows chromosomes aligned in a way that is characteristic of metaphase (chromosomes attached to spindle fibers and in a more organized alignment compared to prophase - which is the initial stage with less organized chromosomes as seen in the second and third diagrams, and the fourth diagram shows a later stage like cytokinesis).

Answer:

The first diagram (top - left one) shows the phase (metaphase) right before anaphase.