Which Best Describes Sibling Relationships Over the Adulthood Years

Which best describes sibling relationships over the adulthood years?

A) Sibling rivalry disappears once the children are on their own.
B) Most siblings share intimate problems frequently across the years.
C) Siblings often grow emotionally closer from middle age to old age.
D) Significant life events like the death of a parent can bring close siblings together and push rival siblings apart.