18. The writer wants to support the main argument of the third paragraph (sentences 10–12) by adding information from another relevant source. Which of the following sources would achieve this purpose?
- An article about later school start times from world experts on sleep at the National Sleep Foundation
- A direct quotation from a blog post by a pediatrician whose teenager has depression
- A summary of the results from a study on healthy lifestyle choices in a leading health magazine
- An excerpt from an interview with a seasoned high school teacher that appeared in the school newspaper
- A pamphlet from a pharmaceutical company full of testimonials from teens who have had positive results with a sleep aid medication