What Prevents a Foreign Species' Sperm from Fertilizing an Egg

Multiple Choice

What prevents a foreign species' sperm from fertilizing an egg?

A) Nothing prevents fertilization if chemical and other behavioral cues allow mating
B) Egg recognition proteins on the acrosomal process bind to specific sperm receptors on the vitelline envelope
C) The size and shape of sperm must fit the hole in the egg membrane
D) The cortical reaction by the egg actively draws in the sperm