(B) All traffic
The All Traffic report indicates all the sources and mediums from where traffic arrived at your website. You can check this by going to Acquisition > All Traffic > Channels or Acquisition > All Traffic > Source/Medium. Here, you will find a report that shows all the channels, sources and mediums for every visit to your website for the time period selected.
This question is a part of the Google Analytics Individual Qualification. You can get all the answers with detailed explanation for this exam in our Google Analytics Individual Qualification Exam Answers page.