Amanda looks at an animal cell under a microscope and sketches the cell. She notices that the cell is in a phase of mitosis, so she asks her friend to identify the phase. Her friend identified the cell as being in prophase. What should she be observing in order to correctly label her sketch as prophase?

A. the chromosomes are visible, spindle fibers form, and the nuclear envelope disappears.
B. the cytoplasm starts to split into two new cells and the two new nuclei develop
C. the chromosomes move away from the center to either side of the cells.
D. the duplicated chromosomes line up at the center of the cell