When Zebrafish Eggs Are Laid,they Are Surrounded by a Tough

When zebrafish eggs are laid,they are surrounded by a tough chorion.Sperm are unable to get through this chorion and must find the tiny tunnel called a micropyle that provides a channel to the egg cell membrane.This channel is so tiny that only one sperm is able to fit through at a time.The micropyle most likely

A) aids in preventing polyspermy.
B) prevents sperm from other species from fusing with the egg.
C) evolved from a similar structure found in fruit fly eggs.
D) ensures that the head and not the tail of the sperm fuses with the egg.
E) is a mechanism to ensure that the zygote is diploid and not haploid.