I think it's B. Because if you're wearing something that filters oxygen (E.g. gas mask) and the substance becomes airborne, the filters in the protective gear might be overworked if the substance density is greater than the filtering capacity.
Running and jumping are common ones.
D. Regular exercise has been shown to reduce the physical effects of stress
I don't see any options to choose from on this Question but I do know this: If a family has a good, strong foundation, the kids won't be rebels and they won't always disagree (all kids do occasionally but not always). The parents will stay together and they themselves won't be constantly arguing. Overall, the family will have a good relationship with good communication between parents and kids. Hope this helps! If you get more than one answer and see it fit to do so, please mark me Brainliest Answer! Thank you!