Answer:flexibility and elasticity
Explanation: Blood vessels lose their elasticity as we get older.
Well, people in South Africa can't have a proper healthcare, and thinking with logic, it's not too good. Also, lack of food and water is a problem, because, for example, children are malnourished and they die at the young age because of diseases caused by they haven't eaten properly, like- you know what I mean.
I think it would be A I'm 80 percent sure
