Answer:
A) Prophase
Step-by-step explanation:
Prophase is characterized as the first of the mitosis process, which is basically a preparatory step for the cell before it begins to divide. Thus, some events must happen during this interphase process, being extremely essential for the cell cycle itself.
It is during this phase that the cell DNA, or rather chromatin, begins to self-condense, and this is exactly what we can see in the image above, referenced by the letter D.
The nucleolus, in turn, also disappears. And this is characteristic of the very standstill that occurs in synthesizing the cell.
Thereafter, duplication and migration of the centriole to the other end of the cell also occurs, which is capable of forming spindle fibers and microtubules. The nuclear membrane, in turn, also disappears as well as the nucleoli.