It should be D, since the document in question has a person included themselves in the event.
The answer is c. That’s the only one that’s correct the rest is incorrect
<span>An increase in scientific and medical discoveries improved life expectancies.
</span>The best possible explanation for the changes in Europe's population since 1750 is that an increase in scientific and medical discoveries improved life expectancies.In fact, it was around this type that basic hygiene norms were implemented, as well as some mortal diseases were cured or to improve lifbetter treated. Moreover, the discovery of vaccinations helped greatly to improve life expectancies.
I believe one of them is the Gettysburg Address
