The sentence that shows HOW algorithms work is D. "They predict what users will want to see based on their interests."
Algorithms are sets of instructions or rules followed by computers to complete specific tasks. In the context of the article, algorithms are used by social media companies to determine what content to show users. These algorithms analyze data such as a user's search history, viewing habits, and social interactions to predict what content the user is likely to be interested in. This process is commonly referred to as "personalization" or "recommendation," and it is used to keep users engaged and spending more time on the platform.
Therefore, the sentence "They predict what users will want to see based on their interests" explains how algorithms work by highlighting their ability to analyze user data and predict what content will be most engaging to each individual user.