Which sentence is the topic sentence in the paragraph

What effect is achieved by the use of the phrase "as the devil would have it" in the second sentence?

Which of the following best describes a situation where odysseus men succumb to temptation

To choose a good persuasive essay topic, begin with a big idea, narrow it down, and a. then narrow it down more; it is impossible to have a topic that is too narrow. b. do some research to see what you should write about c. specify-ask a question you want answered in your argument