Biology

The correct answer is: D.They elongate and pull the chromosomes toward the poles.

During anaphase, the spindle fibers play a crucial role in moving the sister chromatids toward opposite poles of the cell. These fibers shorten at the kinetochore (where they attach to the centromere), pulling the chromatids apart. Additionally, polar microtubules (a type of spindle fiber) may elongate to help push the poles of the cell apart.

The other options are incorrect:

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