Review the sentence boundaries in this environmental study. Paragraph 1: [1] A planning class analyzed tree cover in four city neighborhoods. [2] Satellite estimates were checked against observations made on foot. Paragraph 2: [3] Older blocks contain many mature trees newer commercial streets provide little shade at midday. [4] The report recommends planting along routes used by pedestrians. Which editing decision makes sentence 3 grammatical and preserves the passage's emphasis? The sentence should remain faithful to two related findings about neighborhood shade.