Why Is It Necessary for Many Sperm to Be Present

Why is it necessary for many sperm to be present in order for one to fertilize the egg?

A) The combined enzymes digest a path through the corona radiata and zona pellucida.
B) The combined motion of their flagella enables one sperm to push its way into the egg.
C) A sperm cannot find the egg by itself.
D) A mass of sperm is necessary to gain entry into the ovary.
E) A mass of sperm is necessary to open the uterine tube.

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