Which statement best describes the process of sexual reproduction?

a.
pollen is released with the aid of wind and water.

b.
a sperm cell fertilizes a vertebrate's egg cell, creating a zygote.

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c.
a mushroom ejects spores into the air even in the harshest conditions.

d.
a regular house fly begins as a maggot after budding.

B.  A sperm cell fertilizes a vertebrate's egg cell, creating a zygote.

Explanation:

Not A, because it is showing asexual production, in which, when the pollen lands, it will grow without needing of an opposite gender.

Not C, because it is exactly the same as A, in which it promotes asexual production.

Not D, because while sexual reproduction is needed, it does not give the process, rather, the process of life after being borned (you want an answer that gives the process before birth.

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the answer is c) an oak tree