We Now Know That the Gene for Flower Color and the Gene

We now know that the gene for flower color and the gene for seed color are both on chromosome 1 of the pea plants once studied by Mendel.According to Mendel's results,flower color and seed color undergo independent assortment.Which of the following explanations is most likely?

A) Nonhomologous chromosomes containing the two genes underwent crossing-over to create a new "hybrid" chromosome containing both genes.
B) During a round of meiosis, the female part of a flower failed to separate a homologous pair, forcing the seed color gene to pair up with the flower color gene.
C) Between the time that Mendel studied peas and modern times, one of the genes was translocated onto chromosome 1, so that in modern times, two genes that were once on separate chromosomes are now linked.
D) These genes are so far apart on chromosome 1 that they undergo independent assortment.