John has noticed that many people in his generation tend to be overweight, while pictures of people from older generations show healthy weight when they were his age. what is the most likely reason he is more susceptible to illness? a- older generations had more accurate health information, and people were more active b- people lead more sedentary lives and have a different dependency on vehicles today c- today's generation leaves more active lifestyles and uses current health information d- people eat in excess of healthy foods today and combined it with employment requiring physical labor