Nathan read that students tend to carry backpacks that are too heavy, and he decides to collect data to determine if this is true for his school. Which of the following would be the most appropriate data for Nathan to collect?
A. The weight of students’ backpacks with contents
B. Whether or not students carry a backpack to school
C. The number of books in students’ backpacks
D. The number of days per week students carry a backpack to school