At the beginning of each of these stages of the mitotic cell cycle, how many copies of each distinct DNA molecule are present in a cell? The stages shown are $G_2$ of interphase, prophase and cytokinesis.
- A$G_2$: 1, prophase: 1, cytokinesis: 2
- B$G_2$: 1, prophase: 2, cytokinesis: 1
- C$G_2$: 2, prophase: 1, cytokinesis: 2
- D$G_2$: 2, prophase: 2, cytokinesis: 2