Based on the description provided, the most likely change observed between the two images is:
B. The cell's DNA has been replicated.
During interphase, which is the phase of the cell cycle before cell division, DNA replication occurs. This process involves the synthesis of a copy of the cell's DNA, resulting in two identical sets of chromosomes. Therefore, if the images show the same cell at different points in interphase, and there is a noticeable change between them, it's likely that the cell's DNA has been replicated.