I think it is d but it also might be b but just go with d. it sounds more correct
Answer:
Natural rights and popular sovereignty
Explanation:
In relation to democracy, natural rights are each individual person's right to life, liberty, and the pursuit of happiness (if based on Thomas Jefferson's ideals, life liberty and property if based on John Locke's ideals) which are pretty important as they give each person their indivudual freedoms. Poplar sovereugnty basically means that elected representatives get their power from the consent of the people, which most modern day democracys rely on to stay functioning effectively.
The republic of Rome was not a democracy because not every citizen had the same power
The germans lost so many soldiers, and equipment/armory that they couldn't attack the allies again. It destroyed the German army, and lead to the end of the war.