Stacy often-shops online for books. When browsing other websites, she notices advertisements related to her book preferences. What must Stacy do to prevent her browser from tracking her online preferences? A. delete cookies B. download software C. click an advertisement D. avoid shopping online

To prevent her browser from tracking her online preferences, Stacy should take the following action: **A. delete cookies** Here's the reasoning: 1. **Cookies** are small files stored on a user's computer by the web browser while browsing a website. They are used to remember information about the user, such as login details and preferences, which can lead to targeted advertisements based on browsing history. 2. **Deleting cookies** will remove this stored information, which can help prevent websites from tracking her preferences and showing her targeted ads. 3. **Downloading software** (Option B) could refer to ad blockers or privacy tools, which can also help, but the most direct action related to tracking is deleting cookies. 4. **Clicking an advertisement** (Option C) would likely lead to more tracking, not less. 5. **Avoiding shopping online** (Option D) is not a practical solution for someone who enjoys shopping online. Therefore, the best answer is **A. delete cookies**.