4) Which of these is the most accurate summary of Zeynep Tufekci's explanation of why YouTube can sometimes "radicalize" viewers by serving up increasingly polarizing content? YouTube is selecting video content based on a person's political preferences. YouTube is steering viewers toward specific points of view. YouTube is attempting to get people to view more videos so that its parent company (Google) can serve up more ads. YouTube is effectively censoring some content by encouraging viewers to watch other content, rather than letting them pick their own videos