Question

During the process of fertilization, which step happens first? A. The sperm's nucleus enters the egg cell. B. Enzymes break down the protective layer of the egg cell membrane. C. A sperm attaches to a binding site on the egg cell membrane. D. The cell membrane of the egg cell changes. E. The sperm looses its tail.

Answer 1

The first step I believe is B. Enzymes break down the protective layer of the egg cell.

Answer 2

fertilization refers to the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote.
During the process of fertilization A sperm attaches to a binding site on the egg cell membrane.
Hence C is the right option.
I hope it helps.