D because you are not becoming a citizen via birth, you need to complete and pass a test (i asked my immigrant mom)
Answer: Fabio's attitude changed because he'd be in the parade.
Explanation: Fabio is excited to be able to participate in the parade. The focus of the question isn't on why he'd be in the parade or how? But on what makes his attitude change. Every other factor mentioned corroborates that he'd be participating in the parade.
The fourth excerpt should be right
Based on the given statement above, in my opinion and own observation, I would say that I agree. People work because they need to sustain their daily needs, and because of that need, most people try to take as much as they can to support it. Giving back becomes little because there is only little that is left from work too. Hope this answers your question.
