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The sentence presents a clear cause-and-effect chain: an intervention (“extended voting hours” and “opened additional polling sites”) followed by a measurable outcome (“turnout among working adults increased”). Option B collapses those details into an accurate main idea. Option A contradicts the reported increase; C ignores the observed behavioral change; D invents confusion not mentioned. On PERT Reading, main-idea questions often require compressing a procedural change plus outcomes into one sentence without adding speculation. Look for structural cues: the introductory “After…” flags a policy shift; coordinated actions (“extended… and opened…”) suggest a multi-pronged strategy; the concluding clause reports impact on a defined group (“working adults”). A strong habit is to ask: What changed? Who was affected? How? Then select the answer that faithfully captures these elements. In academic and civic texts, this ability to abstract policy interventions into their intended and measured effects is essential for summarizing articles, memos, or reports, and it prepares you to evaluate whether the evidence supports the claim. Here, the evidence directly states a positive effect on turnout for a specific demographic, so B is correct.