Place the Following in the Correct Order

Multiple Choice

Place the following in the correct order:
1) aided by enzymes on their surface, sperm penetrate the cells of the corona radiata
2) acrosomal reactions are triggered when sperm bind to receptors in the zona pellucida
3) syngamy occurs when a sperm cell binds to receptors on the oocyte's plasma membrane
4) acrosomal enzymes from many sperm digest through the zona pellucida
5) zygote is formed

A) 1, 2, 3, 4, 5
B) 1, 2, 4, 3, 5
C) 4, 2, 1, 5, 3
D) 2, 4, 1, 5, 3