Final answer:
Option B is the best revision, as it corrects grammatical issues and provides a clearer flow of ideas while keeping the original meaning intact.
Step-by-step explanation:
The best revision that improves the language in the passage while keeping the original meaning intact is Option B: 'Learning Latin is still valuable today because the language affected many modern English words passed down through the generations, such as subject and progress.' This option is grammatically correct and maintains a concise flow of ideas. It corrects the sentence fragment found in the original passage and provides a smoother transition between ideas with the use of 'such as,' which implies examples are being provided without interrupting the sentence structure.