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Why can it be said that, biologically, 'the father determines the sex of the child' in humans? contributes an X or a Y

Question
Why can it be said that, biologically, 'the father determines the sex of the child' in humans? contributes an X or a Y
Because the mother always contributes an X, so the variable factor is whether the father
Because the father contributes more genetic material overall
Because only fathers have sex chromosomes
Because mothers cannot pass on any chromosomes at all
Answer
Because the mother always contributes an X, so the variable factor is whether the father
Detailed Explanation
Since the mother invariably contributes an X chromosome, the determining variable is which sex chromosome (X or Y) the father's sperm contributes.
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