Tiana is researching the effects of social media on adolescents' interpersonal relationships. Which is the most credible source on her list?

the biography of the founder of Twitter on a university's website

a website that allows teens to connect and chat with friends

the American Psychological Association's website

a blog in which a teenage girl shares stories about her life

the American Psychological Association’s website

The American Psychological Association's website is the best choice. This is because the information found on this site is researched and has been proven through valid studies. This site would not just report on how adolescents are using social media, but they would also report on the effects of the social media use. The website allowing teens to connect and chat and the teenage girl's blog are both primary sources which could be used to show how teens are using social media and engaging in relationships online. However, these primary sources do not analyze the effects of social media on relationships. The biography of the founder of Twitter also would not be a good choice. Just because he created Twitter does not mean he has any idea how Twitter effects the interpersonal relationships of adolescents.

C. the American Psychological Association's website