The correct answer is c) Interphase.
Interphase is the phase of the cell cycle where the cell prepares for division and is the time when DNA replication occurs. It consists of three sub-phases: G1 (growth), S (synthesis, where DNA is replicated), and G2 (preparation for mitosis). During the S phase of interphase, each chromosome is replicated to produce two sister chromatids, ensuring that each daughter cell will receive an identical set of chromosomes during cell division. The other phases—prophase, anaphase, and telophase—are stages of mitosis, which follow interphase and involve the separation of duplicated chromosomes rather than their replication.