Which of the Following Is a Reason Why Great-Grandparents Do

Which of the following is a reason why great-grandparents do not have close relationships with their great-grandchildren?

A) Great-grandparents are often kept at a distance by the grandparents.
B) There may be too many great-grandchildren,and therefore,great-grandparents do not feel an emotional tie.
C) Great-grandparents lack interest in being involved in raising great-grandchildren,and therefore,don't build relationships.
D) Close relationships between great-grandparents and their great-grandchildren usually only occur when the grandparents maintained a good relationship with their parents.