A bar graph shows the number of books read by students in a month: John (8), Mary (10), Alex (6), Sara (12). Who read the most books?
Correct: D
In a bar graph, the height of each bar corresponds to the quantity or frequency it represents. To find who read the most books, we look for the student with the highest number of books. Sara read 12 books, which is the highest number among all the students.