Answer:
A: 3
B: 1
C: 2
Step-by-step explanation:
A mentions a study that shows overloaded backpacks put stress on the spine so it matches with 3 because 3 mentions that textbooks are too heavy to carry
B mentions that e-readers get updated quicker using the internet and 1 is discussing that e-books are more up to date than textbooks
C mentions that schools can save a lot of money by using e-readers and 2 mentions that e-readers are most cost efficient than regular books.