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The text first diagnoses the problem’s locus (“dwell time” at stops), then prescribes remedies aligned precisely with that diagnosis (all-door boarding, off-board payment, level platforms), and finally reports outcomes (18% trip-time reduction). This is a classic problem (diagnosis) → solution (targeted remedies) → evidence (results) structure, making B correct. A is ill-suited; there’s no anecdotal narrative or moral. C would profile agencies over time; not present. D would define terms and categorize them; the passage is action-oriented, not taxonomic. For Nelson–Denny structure questions, look for alignment between causes identified and solutions proposed, and for quantified outcomes that close the loop. The specificity of the interventions directly addressing the diagnosed bottleneck (boarding processes) signals a targeted remedy pattern rather than generic advocacy or storytelling.