Why Does the Tip of a Sperm Contain Enzymes

Why does the tip of a sperm contain enzymes?

A) The enzymes are used to prevent other sperm from entering the egg after the sperm and egg membranes have fused.
B) The enzymes are needed to digest a hole in the protective covering of the egg.
C) The enzymes are released to kill other sperm so that,by the time sperm reach the egg,only a hundred or so remain with which to compete.
D) The enzymes are gradually released into the sperm,where they break down sugars,releasing the energy needed to power sperm movement.