When does sex determination occur in humans?

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Question

(B) In humans,sex determination is genetic and occurs at the time of fertilization.When a sperm carrying either an $X$ or a $Y$ chromosome fertilizes

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At the time of fertilization

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(B) In humans,sex determination is genetic and occurs at the time of fertilization.When a sperm carrying either an $X$ or a $Y$ chromosome fertilizes an egg (which always carries an $X$ chromosome),the sex of the zygote is decided.If an $X$-bearing sperm fertilizes the egg,the zygote becomes $XX$ (female).If a $Y$-bearing sperm fertilizes the egg,the zygote becomes $XY$ (male).Therefore,the sex is determined at the moment of fusion of the male and female gametes.

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