B. False. Maintaining an unhealthy weight would cause stress on the body, but maintaining a healthy weight does not.
I would say b., mostly because it is good to have them know why they need to act in such a manner not just the "style" of which the behavior is being done. Sometimes it is difficult for them to refine their behaviors, but it can produce progress
Since it’s 2020 and we are going through a pandemic atm you could put someone like: An action I would take to improve their health of my school would be to have classrooms sanitized and bathrooms have refilled soap. This will improve less germs to spread and less people to get sick. Once someone gets sick their immune system is low and they are at higher risk to catch something worse.
(I put for bathrooms to have soap refilled because ik my school sucks at that XD) but you’d am always change how you word it.