6. Which detail best expresses the author's use of rhetoric to advance his argument? A. "Search engines, like most online services, are judged using an array of metrics, one of which is user engagement." (Paragraph 6) B. "It turned out this story was fake, but people searching for it were largely exposed to misinformation related to the original fake post." (Paragraph 12) C. "We made the game available publicly and advertised through various social media channels. Overall, we collected 2,100 responses from over 30 countries." (Paragraph 15) D. "Otherwise market economies and people's natural inclination to be attracted to eye-catching links will keep the vicious cycle going." (Paragraph 17)