During anaphase of mitosis, what happens to sister chromatids?

• A. They decondense into chromatin and new nuclear envelopes form around each set of chromosomes.
• B. They align along the metaphase plate and attach to spindle microtubules from both poles.
• C. They condense into visible chromosomes and the nuclear envelope breaks down.
• D. They separate at the centromere and are pulled to opposite poles of the cell.

Answer: (D)