A. Alcohol-based sanitizer: Alcohol-based sanitizers are effective for hand hygiene when there is no visible dirt or grease. They are generally used for routine hand antisepsis in situations where hands are not visibly soiled. For procedures involving body fluids, if hands are visibly soiled, traditional handwashing with soap and water is preferred. B. Disinfectant scrub: Disinfectant scrubs are generally used for cleaning surfaces and are not appropriate for personal hand hygiene. C. Antiseptic solution: Antiseptic solutions are used for cleaning skin before injections or procedures, not typically for hand hygiene. D. Liquid soap: Liquid soap is suitable for handwashing, especially when hands are visibly soiled or after exposure to body fluids. In the context of body fluids, soap and water would be preferable to ensure effective removal of contaminants.