In Biology Lab,as You Are Examining Plant Root Cells,you Are

In biology lab,as you are examining plant root cells,you are having difficulty determining what you are seeing as in the image below.You can still see chromosome strands,as they are in compact bundles.You think this should be telophase,because the chromosomes aren't being actively pulled apart,but when does cytokinesis start? The first sign that cytokinesis has started is the formation of a

A) nucleolus.
B) nuclear envelope.
C) spindle fiber.
D) cell plate.
E) cleavage furrow.