The answer to this question can be quite subjective. Some people will say that the telephone is the most important invention, or the automobile, or the plane, but for me personally, I'd choose antibiotics.
It is a modern-day invention (as opposed to the Middle Ages, for example) which changed our lives for the better. Before penicillin was discovered in the 1920s by Alexander Fleming, people were constantly dying because of most harmless diseases. But after antibiotics were invented, people were given a chance to recover from their illnesses much more easily.
I don’t believe this question truly applies to any of the candidates, but I would have to go with Andrew Jackson. Jackson won the popular vote and had the most total votes, but John Adams still won in electoral college. Therefore Jackson would be your answer because he received the most votes but failed to gain the majority of the electoral college.
Have a nice day.
The answer would be D, ruled by a small group.
Southeast Asia. This is mostly because of the war