Answer:
The best way to write sentence 25 is option A: "Some of the records that fell were pretty old and it was about time for new ones." This option uses a conjunction to connect the two clauses and make the relationship between them clear. Option B uses a conjunction that suggests a causal relationship that may not be intended. Option C uses a period to separate the clauses, which makes the relationship between them less clear. Option D is not a viable choice, as the original sentence is not grammatically correct.