Children Typically Have Some Characteristics Not Seen in Either of Their

Children typically have some characteristics not seen in either of their biological parents. Which one of the following is the most common source of these unique
Characteristics?

A) Some segments of genetic material at the equivalent locations in paired chromosomes cross over, essentially swapping places.
B) Grandparents or great-grandparents may chemically "shield" certain genes, with these shields eroding only gradually over several decades.
C) When certain aspects of the meiosis process are delayed by several weeks, new genetic patterns inevitably emerge.
D) Certain segments of genetic material erratically and unpredictably "leap" from their initial chromosome to a very different one, typically as a result of high hormone levels in the mother.