1. The problem asks us to interpret a box plot representing classroom attendance last month. 2. A box plot shows the distribution of data using five key points: minimum, first quartile (Q1), median (Q2), third quartile (Q3), and maximum. 3. The box represents the interquartile range (IQR) between Q1 and Q3, showing where the middle 50% of data lies. 4. The dots at the ends represent the minimum and maximum values. 5. In this box plot, the three quartiles (Q1, median, Q3) are clustered toward the right (higher values), and the right dot (maximum) is farther right. 6. This clustering toward the higher end indicates that most attendance values were high last month. 7. Therefore, the correct conclusion is: B. Attendance was mostly high. You can tell from the clustering of three quartiles toward the right, or high end, of the number line.