Which Best Describes Why Grandparents Would Be the Primary Caregivers

Which best describes why grandparents would be the primary caregivers for their grandchildren?

A) Because they fell in love with the newborn and wanted that small person to be a part of their lives
B) Because the parents were drug abusers or in the prison system
C) Raising a grandchild is easier because grandparents have already been experienced parents
D) Raising a child gives purpose to life for the grandparents