Fraternal twins, while conceived at the same time, are not genetically identical. Which statement best explains why these siblings are genetically different from each other?

A. One chromosome from each pair randomly passes to the sex cells during meiosis and leads to differences between the siblings.

B. One chromosome from each pair randomly passes to the sex cells during fertilization and leads to differences between the siblings.

C. Mutations occur during meiosis and lead to differences between the siblings.

D. Mutations occur during fertilization and lead to differences between the siblings.