A Series of Events Occur During Fertilization

A series of events occur during fertilization.Place the following events in the proper order in which they occur.
a.The "slowblock" occurs.
b.A single nuclear envelope surrounds both sperm and egg pronuclei.
c.The acrosomes of sperm release digestive enzymes that allow the sperm to pass through the zona pellucida to the egg plasma membrane.
d.Sperm cover the surface of the egg and secrete enzymes that help weaken the corona radiata.
e.Pronuclei are formed.
f.The "fast block" occurs.
g.Microvilli bring the entire sperm into the egg.
h.Sperm squeeze through the corona radiata and bind to the zona pellucida.

A) a,e,b,d,f,c,g,h
B) d,h,c,f,a,g,e,b
C) d,b,g,a,f,c,e,h
D) f,a,d,h,c,g,e,b
E) e,d,h,c,a,f,b,g