During metaphase of mitosis, which of the following events occurs?

• A. The nuclear envelope reforms around each set of chromosomes and the mitotic spindle disassembles.
• B. Chromatin condenses into visible chromosomes and the mitotic spindle begins to form as centrosomes move apart.
• C. Sister chromatids separate and move toward opposite poles of the cell.
• D. Chromosomes align at the cell's equatorial plane (metaphase plate) with sister chromatids attached to spindle microtubules from opposite poles.

Answer: (D)