6. The drug cytochalasin B binds to the barbed end of actin. Which of the following events of the cell
cycle in animal cells would be most likely disrupted by cytochalasin B?
(A) spindle formation
(B) spindle attachment to kinetochores
(C) separation of sister chromatids
(D) movement of chromosomes to the poles during anaphase
(E) cleavage furrow formation and cytokinesis