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Option B uses a subordinating conjunction (“Although”) to show contrast between missing the bus and still arriving on time. It smoothly combines all three ideas with appropriate coordination (“and”) and preserves the causal/temporal relationship. Option A is acceptable grammar, but “but” before “arrived” makes the structure slightly clunky and less precise in expressing contrast followed by outcome. Option C misuses a semicolon with “and” and creates punctuation issues. Option D asserts a causal “therefore,” implying missing the bus caused running to school, which is plausible, but the nuance of concession (“despite missing the bus”) is clearer and stylistically superior for STAAR revision items. RLA objectives emphasize sentence combining, variety, and maintaining meaning while improving clarity and coherence. Students should recognize correct use of subordinating conjunctions to express relationships among ideas, avoid run-ons or comma splices, and choose punctuation that supports flow. Practicing targeted revision strengthens command over complex sentences and aligns with TEKS expectations for editing and composing.