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Question 132·Hard·Text Structure and Purpose

Many observers hail the city's new riverfront park as a triumph of community design, pointing to packed weekend concerts and a surge of café openings. Yet these bellwethers, urban sociologist Lina Ortega argues, obscure how the project displaced long-standing markets and severed bus routes that once knit the district together.

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