According to David Orenstein, the two things are the foundation for social life groups and group activities.
Option (C) is the correct option.
What is the foundation of social life?
According to David Orenstein, the basic foundation of social life is groups and group activities.
He thinks that if people participate in groups, it will be good for their social life.
Social life is important, as people who gather socially are happier than people who are alone.
Thus, option (C) is correct.
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