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

• A. Chromatin condenses into visible chromosomes and the mitotic spindle begins to form.
• B. The nuclear envelope fully re-forms around each set of chromosomes and chromosomes decondense.
• C. Sister chromatids separate and move toward opposite poles of the cell.
• D. Sister chromatids align at the cell equator (metaphase plate).

Answer: (A)