The choice that provides the best conclusion to the passage is this; fare-free public transportation is not the answer.
What is the conclusion?
The main point that can be taken towards the end of the passage is that fare-free public transportation is not the answer to the problems the people were battling.
Note that a conclusion is the final part of something, like a story, argument, speech, or piece of writing. It signifies the completion of the content or the resolution of a conflict or issue. A conclusion can also summarize the main points or arguments presented earlier.