What life course principle was illustrated in the research on work-family trade-offs?

Question

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The research on work-family trade-offs demonstrates both the life course principles of social norms changing with historical periods (A) and people making decisions based on the opportunities available to them during their time in history (B). This research illustrates how the balance between work and family has shifted over time and how individuals must make choices based on the options that are available to them at different points in their lives.

What Life Course Principle Was Illustrated in the Research on Work-Family