@Jaimee-Salgado the flaw here is assuming that not dying from iatrogenic "disease" means living. What if I did not get an iatrogenic disease but still died from natural causes, for example?
Notice that this is what (C) points out, i.e. the argument fails to consider that "people who do not die of one cause [iatrogenic disease] may soon die of another cause [natural causes in my example]."
Now let's take a look at (E), "whenever a noniatrogenic disease occurs, there is a risk of iatrogenic disease." This is not the fallacy here. The argument is about preventing all iatrogenic diseases and the impact on the number of deaths per year.
Hope that helps! Please let us know if you have any other questions.