The correct answer is: Acquisition
The Acquisition reports provide information about where your traffic originates (e.g., google, baidu, bing), the methods by which users arrive at your site or app (e.g., organic, cpc, email), and the marketing efforts you use to drive traffic (e.g., campaign, creative format, keywords).
Access the Acquisition reports
To access the Acquisition reports, click Reports > Acquisition in the left navigation. If you don’t see the reports, an administrator may have removed them from the navigation.
Read more here: https://support.google.com/analytics/answer/10999979