Answer:
The correct answer is D. separases
Step-by-step explanation:
A protein complex called cohesin helps in holding the two sister chromatids with each other from the point of DNA replication until the starting of the anaphase.
Separase is the enzyme which acts on cohesin proteins and helps in the hydrolysis this protein which results in the segregation of chromatids opposite to each other and beginning of the anaphase stage of the cell cycle.
In anaphase, these chromatids are pulled towards each pole by spindle fibers and this phase is followed by the final phase called telophase. So the correct answer is D.