4. Which sentence presents an unsound argument? I enjoy going to the dentist because she helps me take care of my teeth. I have to find a new dentist because my former dentist is retired. Dentists are often not popular with children. My dentist is the best because he is my neighbor.

The brother of a presidential candidate writes an editorial in which he defends this candidate against charges of corruption. in such a circumstance, it is most appropriate for the reader to a) suspect that the candidate may have been framed. b) consider whether the candidate has the best family or not. c) wonder if the writer may be biased, due to his family connection. d) wonder if the writer may be inaccurate, due to wanting to get people to read his column. \