I found the exercise online and this is the answer:
A. Non dividing cells exit cell cycle
B. At this point, cell commits to go through the cycle.- If the cell passed the checkpoint, it can now enter the cycle, starting on the first stage: G1
C. DNA replicates - The cell starts replicating the DNA in the S phase to then later, separate it in two cells.
D. Centrosome replicates
E. Mitotic spindle begins to form. in the M phase, after passing the G2 checkpoint
F. Cell divides, forming two daughter cells.- After passing the last checkpoint, the call can finally start mitosis process.