A bar graph of preferred study locations among 100 students shows bars with heights: Library 40, Cafeteria 15, Dorm 25, Coffee Shop 20. Which category is the mode and why?

• A. Cafeteria, because it offers an informal atmosphere that likely influences many students even if its bar is not the tallest.
• B. Coffee Shop, since the presence of nearby coffee shops affects study habits.
• C. Dorm and Library together because both environments are commonly used.
• D. Library, because its bar is tallest at 40 students, indicating the highest frequency.

Answer: (D)