During Which Phases of the Cell Cycle Does a Chromosome

During which phases of the cell cycle does a chromosome consist of two identical chromatids?

A) from the beginning of G₂ phase in interphase, through the end of prophase in mitosis
B) from the end of G₂ phase in interphase, through the end of telophase in mitosis
C) from the beginning of G₁ phase in interphase, through the end of anaphase in mitosis
D) from the end of S phase in interphase, through the end of metaphase in mitosis