Which of these sentences use a dash for punctuation

To become the mesmerizer’s subject, twain must displace hicks. twain presents himself as very different from hicks. based on this contrast, what does twain seem to value and admire in a person ?

Which excerpt from "hills like white elephants" provides the most details about the main characters' lives outside the railway station? click here to read an excerpt.

Why might a reader look for an idea that is restated? to craft a summary of the article to find the subheadings in the article to identify the article's main idea to locate the article's key support