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The paragraph proceeds stepwise: it introduces a method (apps + expert review + model), identifies a limitation (accuracy drops with highway noise), then describes a refinement (noise profiles raise performance), and ends with practical recommendations (mic placement, wind shields). That sequencing is classic method–limitation–refinement–guidance, matching B. C would profile a person; absent. D would define terms and classify them; not the case. A would tack on an unrelated ending; here, each step logically leads to the next. On Nelson–Denny structure questions, look for the middle sentence that flags a constraint (“lowest near highways”)—a pivot around which the refinement turns. The final operational advice signals an applied orientation, common in science-and-citizen-science passages that move from innovation to field practice. Selecting the label that captures this pipeline from problem identification to improved procedure mirrors the author’s intent and guards against distractors that mischaracterize a clearly methodological narrative.