Which of the following supplies are required for proper handwashing technique?

The correct choice emphasizes the importance of bar soap as a fundamental supply for proper handwashing technique. When washing hands, using soap is essential because it helps to break down oils and grime on the skin, allowing the mechanical action of scrubbing to remove dirt, bacteria, and viruses effectively. Soap can help make the entire process more efficient by reducing the surface tension of water, thus allowing it to better cover the skin and remove contaminants.

While antibacterial gel can be effective in reducing certain pathogens when soap and water are not available, it is less effective when hands are visibly dirty or greasy. Disposable towels are helpful for drying hands after washing but are not essential for the washing process itself. Plastic gloves play a role in protecting hands during specific tasks, but they do not contribute to the act of handwashing itself. Therefore, the requirement of soap emphasizes the best practice for achieving hygienic hand cleanliness.