The part of cell division that causes the separation of the cytoplasm is mitosis meiosis cytokinesis

The correct answer for the fill in the blank is the Cytokinesis.

Cytokinesis means the division of the cytoplasm. It is a physical process which occurs after mitosis and results in the splitting of parent cell into two daughter cells which are identical.  

During this process, the cleavage furrow is formed by the pinching in action of the cell membrane at the cell equator. This results in the separation of the cytoplasm, giving identical two daughter cells.

Thus,  the part of cell division that causes the separation of the cytoplasm is referred as Cytokinesis.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.