All of the answers to this question, A. Your hands are visibly dirty, B. Between patients, C. Your hands are visibly contaminated with blood or body fluids, D. Before and after eating, E. After using the restroom, are correct. Everyone needs to wash their hands, but especially health care officials who deal with germs for a living.
When the World Health Organization conducted their research in 2013, they found that only 60% of the time do doctors wash their hands. They also found that only 71% of the time do nurses wash their hands. Both are low numbers, seeing that they should both wash their hands 100% of the time.