What important information should the nurse provide to a pregnant client whose husband is a chain smoker?

The importance of option B lies in the established evidence correlating secondhand smoke exposure to fetal growth restriction. Research indicates that when a pregnant individual is exposed to secondhand smoke, it can lead to a variety of adverse outcomes for the developing fetus, including low birth weight and impaired growth. This occurs because harmful chemicals in tobacco smoke can hinder blood flow and oxygen supply to the fetus, ultimately affecting its growth and development.

In contrast, the other options do not accurately represent the known effects of secondhand smoke. The framing of alpha-fetoprotein levels does not correlate in this context. Additionally, it is important to understand that secondhand smoke affects both the mother and the fetus, not just the mother. Lastly, the notion that being in a different room provides safety is misleading; harmful substances from smoke can linger in the air and settle on surfaces, exposing the pregnant person and the fetus to risks even when they are not in immediate contact with the smoker. Thus, emphasizing the correlation between secondhand smoke and fetal growth restriction provides the essential information the nurse should communicate to the client.