The answer to your question is A ;)
Eat healthy foods salads and good stuff for their heart and no drugs so their heart is healthy and excersice for them to get in shape and health and healthy
Hypercapnia, also known as hypercarbia and CO2 retention, is a condition of abnormally elevated carbon dioxide (CO2) levels in the blood. Carbon dioxide is a gaseous product of the body's metabolism and is normally expelled through the lungs.