The answer to your question is A. TRUE
Because developed nations have proper healthcare, hygiene, environment, and standard ways of living, it can sustain and take care of its residents. Residents can live peacefully without fearing for their next meal and because they are nourished and pampered well, they can easily enjoy and have the time to interact with each other. Human interaction is crucial to the development of nations because happy people tend to live longer. Because of living longer and healthier, they are able to reproduce properly.
Well you dont have any following statements for me to answer, i can say one thing, weight and energy are the same because depending on if you are going to gain or lose weight, loseing weight causes more energy usage out of you and if you are gonna lay off and gain weight, it causes less energy being used out of you, energy depends on the weight
C is correct because it’s documented