In humans, XO individuals are females with Turner's syndrome and XXY individuals are males with Klinefelter syndrome. Which of the following events may not give rise to a Klinefelter male?
A. Nondisjunction at meiosis I in the father.
B. Nondisjunction at meiosis II in the father
C. Nondisjunction at meiosis I in the mother.
D. Nondisjunction at meiosis II in the mother.
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