question: Q:Fertilization begins when sperm binds to the corona radiata of the egg. Once the sperm enters the cytoplasm, a cortical reaction occurs which prevents other sperm from entering the oocyte. The oocyte then undergoes an important reaction. What is the next reaction that is necessary for fertilization to continue?? 
  {'A': 'Release of a polar body', 'B': 'Degeneration of the sperm tail', 'C': 'Acrosome reaction', 'D': 'The second meiotic division', 'E': 'Formation of the spindle apparatus'},