Answer:
Example of dependent clause:
I'm not tidying the dishes unless Sarah helps.
Unless Sarah helps is your dependent clause because can't stand alone as sentences.
The answer is the 4th one
Answer:
Both Bernie Sanders and Donald Trump, for example, have proposed changes that would be considered rebellious by most.
Explanation:Sentence 2 says that they have promoted new ideas that are anti-establishment. This option backs up that claim.
Considering the tone and the message in the excerpt, I believe the correct answer to be option C: "All people should dedicate a fair amount of their time to politics", this is because of the way Roosevelt says that everyone has a civic duty and there is no excuse that justifies not fulfilling said duty. He also says that voting is the least a person could do and by doing so, is not to be regarded as a "good citizen" since they could be doing more. So basically, it isn't option A or B or D, especially this last one since he condemns people who vote not just those who do not vote.