Final answer:
Two new nuclear envelopes begin to redevelop during the telophase phase of cell division, which is the final stage before the cell divides into two separate daughter cells.
Step-by-step explanation:
During what phase of cell division do two new nuclear envelopes begin to redevelop? The correct answer to this question is C) telophase. During telophase, the final phase of mitosis, the chromatids have reached the opposite poles of the cell, and reformation of the nuclear envelopes around the two sets of chromosomes begins. This marks the near end of the process, preceding the division of the cytoplasm known as cytokinesis. To further understand the context, in prophase, the nuclear envelope breaks down, and the chromosomes condense. In anaphase, the sister chromatids separate and move towards opposite poles of the cell. During metaphase, chromosomes line up in the center of the cell. Thus, the reformation of nuclear envelopes is a characteristic of telophase, signifying the cell is nearly ready to split into two separate daughter cells.