Riley found a source to learn more about human immunodeficiency virus (HIV)."HIV/AIDS Basics Prevention.” Centers for Disease Control & Prevention, https://www.cdc.gov/hiv/basics/prevention.html. Accessed 6 Jan. 2017.What most likely made Riley feel confident about this source?

The citation identifies the publisher as the Centers for Disease Control & Prevention (CDC), a U.S. government public health agency, and the URL ends in .gov. That government source is the reason Riley would most likely feel confident about the information. The citation does not identify it as a magazine, social media, or blogging site.

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