Hi, thank you for posting your query here in Brainly.
All you have to do is understand each information clearly and write it down to help you picture out the problem. After doing so, you will find that the correct order of people in the line is
Frank -> Betty -> Mark -> Mary -> Andy -> Chris
Hence, Mary is situated between Mark and Andy, and is fourth in the line.
At the end of Resistance to Civil Government, he concludes that the American Government does not really promote democracy and only looks out for its own interests, which is why it must not be obeyed.