Read the following short passages and choose the best answers to the questions that follow each passage.
Several coaching centres have recently switched at least partially from study material written by hand on printer paper from study material written on a computer and sent electronically with no use of paper at all. Therefore, less printer paper will be used as a result of these changes than would have been used if these coaching centres had continued to use handwritten study materials.
Which of the following, if true, most strengthens the argument above ?