Use Figure 12.1 and the information here to answer the following questions. The unlettered circle shows a diploid nucleus with four chromosomes. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is symbolized as black and the other haploid set is gray. The chromosomes in the unlettered circle have not yet replicated. Choose the correct chromosomal conditions for the following stages. Which process formed the cell at A?

a.) meiosis I

b.) meiosis II

c.) anaphase

d.) mitosis