Answer:
A) Protection of the zygote from the drying effects of air was important.
Step-by-step explanation:
Diploid germ cells divide by meiosis to create haploid gametes, like sperm or egg.
Haploid gametes contain half genetic material as compared to the parent cell. Male and female gametophytes release sperm and eggs respectively. When an egg is fertilized by sperm, it becomes a diploid zygote.
Zygote matures into a sporophyte on the gametophyte plant. There is very important of protection of zygote from damage, so Protection of the zygote from the drying effects of air was important.