Ron and His Sister,Sarah,are Both in Their Mid-50s and Have

Ron and his sister,Sarah,are both in their mid-50s and have a close personal relationship.Most research on sibling relationships suggests that:

A) you cannot predict later relationships by looking at relationships earlier in life.
B) they had a close relationship throughout childhood and early adulthood,too.
C) they probably had a tumultuous relationship in childhood that turned close as both matured.
D) they probably had a good childhood relationship that turned neutral in early adulthood then recently returned to closeness.