B) it demonstrates the complexity and the technical subject matter
The phrase "MPF Triggering a Chain Reaction of Protein Activations" is technical language that relates to the scientific process of cell division. The author is likely including this phrase in the text to demonstrate the complexity of the subject matter and to convey the technical details of the scientific process being described. It also helps to convey the idea that many different biological processes are interconnected and interdependent, and that a change in one process can have downstream effects on other processes.