Which of the following events characterizes metaphase of mitosis?

I. Movement of chromosomes to the equatorial plane (metaphase plate) of the cell.

II. A spindle fiber attaches to each sister chromatid.

III. Separation of sister chromatids that are being pulled to the poles of the cell.

• A. I.
• B. II.
• C. III.
• D. I and II.
• E. All of these