Passage Summary: In the past, life was simple and predictable because everyone had a set role; today, technology forces us into many fast-changing roles, which likely makes our relationships messy.

Conclusion: Interpersonal relationships in modern society are likely to be unstable and difficult to predict.

Reasoning: While simple social roles in the past led to stable relationships, modern society involves thousands of rapidly changing, specialized niches.

Analysis: This stimulus sets up a clear contrast between the 'stable and predictable' nature of preagricultural societies and the 'highly particularized' and rapidly changing nature of modern life. Since the author establishes that few, predictable roles lead to stability, the logical completion must apply the inverse to the modern context. Look for an answer that concludes that the explosion of roles and rapid change leads to a decrease in the stability or predictability of our social interactions.