Which Statement Characterizes the Slow Block to Polyspermy in Sea

Which statement characterizes the slow block to polyspermy in sea urchins?

A) It makes the vitelline envelope penetrable to sperm.
B) It involves enzymes from cortical granules dissolving the bonds between the vitelline envelope and plasma membrane.
C) It includes a transient change in membrane potential.
D) It is initiated by the loss of calcium ions from the egg's cytoplasm.
E) It involves enzymes from lysosomes degrading sperm-binding molecules on the inner surface of the egg cell membrane.

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