Sally's husband died two months ago. Sally has been finding it difficult to live on her own

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Question:

Sally's husband died two months ago. Sally has been finding it difficult to live on her own so she has decided to move in with her oldest daughter and will care for her grandchildren while her daughter is at work. This change is Sally's living situation is an example of ___________

Activity theory

Exchange theory

Disengagement theory

Modernization theory