CDC: handwashing prevents illness because:

While it is true that handwashing can reduce the number of viruses on hands, the phrase "viruses accumulate less" is misleading. It does not directly address the primary mechanism by which handwashing prevents illness, which is the removal of pathogens rather than merely reducing accumulation. This choice lacks the specificity needed to explain the effectiveness of handwashing against disease.

This statement is inaccurate in the context of handwashing. While certain pathogens can indeed impact the immune system, the primary focus of handwashing is preventing the introduction of pathogens into the body. This choice does not highlight the direct relationship between hand hygiene and the prevention of illness.

This choice is misleading because it implies that hand sanitizers are the only effective method for removing resistant bacteria. While sanitizers can be effective, handwashing with soap and water is generally more effective at removing a broader range of pathogens, including those that may be resistant to sanitizers. Therefore, this option does not support the primary message of handwashing's role in preventing illness.