Answer: c. The Middlewest is portrayed as adventurous and risky.
Step-by-step explanation:
In the last paragraph, the effect of comparing the American Middlewest to Camelot is that The Middlewest is portrayed as adventurous and risky.
This can be inferred from the passage when we were about the girl on the hilltop, and how and that a rebellious girl is the spirit of the bewildered empire which is called the American Middlewest. The passage showed that the Middlewest can be seen to be adventurous and risky as well.