Hollis University's academic-integrity office has recommended placing two proctors, rather than one, in every final-examination room. Yet the office's own records show that of the dishonesty cases it adjudicated last year, fewer than one in five arose from in-class examinations; the rest involved essays and problem sets completed outside class. Adding proctors, therefore, will do little to lower the overall incidence of dishonesty at Hollis.

Which of the following, if true, most strongly supports the argument above?

A. Cheating in examination rooms is detected far less often than cheating on work completed outside class.
B. Most students found to have cheated on examinations were caught by a proctor rather than by the instructor who later graded the exam.
C. Many students who cheat on out-of-class work say they did so under time pressure created by examinations in their other courses.
D. Instructors who come to regard their examinations as secure tend to shift a larger share of course grades onto work completed outside class.
E. The integrity office adjudicates only those cases that instructors choose to report rather than settle informally.