A nurse is teaching a prenatal class about infection prevention at a community center. Which of the following statements by a client indicates an understanding of the teaching?

A) This statement demonstrates an understanding of infection prevention related to chickenpox. The contagious period for chickenpox is typically considered to end once the sores have crusted over, making it safe to visit a person who has had chickenpox after this time. This reflects appropriate awareness of infectious disease protocols. B) This statement reflects a misunderstanding about antibiotic use, as antibiotics are ineffective against viral infections. Taking antibiotics when they are not needed can lead to antibiotic resistance and other complications, highlighting the importance of understanding when to use these medications. C) Washing hands for only 10 seconds, even with hot water, is insufficient for effective hand hygiene. The Centers for Disease Control and Prevention (CDC) recommends washing hands for at least 20 seconds to effectively remove pathogens, especially after gardening, which can introduce soilborne pathogens. D) Cleaning a cat's litter box during pregnancy poses a risk for toxoplasmosis, a parasitic infection that can have serious consequences for the fetus. Pregnant women are advised to avoid this task or take precautions if they must do it, demonstrating a lack of understanding of specific infection risks associated with pregnancy.