Read the draft passage. Paragraph 1: In a draft about an adult education program, the writer contrasts an earlier problem with a later improvement. Underlined sentence: "the office added a morning route, meanwhile, commuters reached early classes on time." The following sentence develops the result. Paragraph 2: The writer wants to retain both independent clauses and the conjunctive adverb. Which choice best corrects the sentence-boundary error without changing the meaning?