In the case of sea urchin, the correct sequence of events taking place during the interaction of sperm and egg is CORRECT

A. Chemoattraction of sperm to the egg by soluble molecules secreted by the egg

B. exocytosis of the sperm acrosomal vesicle to release its enzymes

C. fusion of egg and sperm cell membranes

D. binding of the sperm to the extracellular matrix of the egg passage of sperm through this extracellular matrix