The correct answer is letter A. Pre-existing conditions are usually the exclusions of health care programs available in most societies. This is the reason why there are a lot of lawsuits filed against healthcare companies who do not fairly adhere with the interests of their clients/patients.
True the heart like any muscle strengthens when you use it
B. Carbohydrates!! Carbs such as rice, bread, pasta etc. turn into sugar once they're digested and sugar gives you energy