Refer to the Figure Below, and Then Answer the Question

Refer to the figure below, and then answer the question that follows.

-Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers.Which event 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