Final answer:
During the S phase of interphase, DNA replication occurs, in which a cell replicates its DNA.
Step-by-step explanation:
The cell cycle consists of interphase and the mitotic phase. During interphase, the cell grows and carries out all normal metabolic functions and processes.
The three stages of interphase are G₁, S, and G₂. Replication of DNA occurs during the S phase, where a cell replicates its DNA.
Therefore, the correct answer is option D: S, Cell Division, Regeneration.