Final answer:
During cytokinesis in cell division, a cleavage furrow forms near the cell equator to facilitate the cell's division into two daughter cells.
Step-by-step explanation:
As a cell undergoes cytokinesis, the structure that forms near the cell equator is the cleavage furrow (option 2). The mitotic spindle arises from the centrosomes (option b) and is responsible for separating the chromosomes during mitosis. The centrosomes move to opposite poles of the cell during prophase, allowing the spindle fibers to elongate and attach to the kinetochores of the chromosomes, organizing them for eventual segregation into the two daughter cells.