What Is an Example of Ambiguous Loss in Which a Family

What is an example of ambiguous loss in which a family member is psychologically absent?

A) Theresa has been diagnosed with Alzheimer's and has difficulty interacting with her grandchildren for whom she had previously provided childcare.
B) Matthew is paralyzed from waist down and is in a rehabilitation facility for two months.
C) Mike lives with his wife and 3 children after being in a drug treatment program for a month.
D) Rudy has been traveling to Asian countries and has not stayed in contact with his family.