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Question 129·Hard·Text Structure and Purpose

Popular retellings of the northeastern United States' return to forest in the late nineteenth and early twentieth centuries present the change as an automatic, 'natural' rebound, attributing it chiefly to the shuttering of small farms and the migration of rural families to factory towns. Environmental historian Lila Morton, however, shows that when we read nursery catalogs alongside town budgets and fire-insurance maps, the regrowth looks orchestrated: municipalities subsidized planting, fuelwood cooperatives coordinated harvests, and early fire-suppression programs stabilized young stands.

Which choice best describes the function of the underlined portion in the text as a whole?