Which stage of mitosis involves sister chromatids moving to opposite ends of the cell?

The correct choice is the stage of anaphase. During anaphase, the sister chromatids that were previously aligned at the cell's equatorial plane are pulled apart by the spindle fibers. This separation is crucial as it ensures that each new daughter cell will receive an identical set of chromosomes. As the spindle fibers shorten, they draw each chromatid toward opposite poles of the cell, effectively moving them away from each other.

This process is essential for the proper distribution of genetic material and is an integral part of the cell cycle, ensuring that both daughter cells have the same genetic information following cell division.