Which of the Following Hypotheses Fails to Meet the Criteria

Which of the following hypotheses fails to meet the criteria of testability?

A) Proper hand washing prevents the spread of infection.
B) A consistent routine of low-impact aerobic exercising will increase coordination among older adults.
C) Patients who use guided imagery during MRI procedures will have reduced perceptions of emotional distress compared with patients who do not use guided imagery.
D) Postoperative patients who receive round-the-clock scheduled analgesics will have lower levels of pain compared with postoperative patients who receive analgesics on a PRN schedule.