Refer to the figure above and then answer the question that follows.
-Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers. Which of the events is likely to produce a higher percentage of abnormal gametes?

A) failure of homologous chromosomes to separate at meiosis I
B) failure of homologous chromosomes to separate at meiosis II
C) failure of sister chromatids to separate at meiosis I
D) failure of sister chromatids to separate at meiosis II
E) failure of sister chromatids to separate at mitosis