A main reason that the age of revolutions initially failed to achieve widespread change in some nations of Europe was because many of these failed revolutions took place in the "backyards" of their mother countries--meaning that they were easily taken down with military power.
DNA makes up who we are. Basically DNA carry's the traits that are being past on down from in which the newborn came from, or any organism for that matter. And those DNA cells come together to put those distinctive traits into you. Such as your personality, eye color, things of that sort,
The correct answer b) social contract.
the other answers are wrong, for example: the divine right of king would mean that the king has a right to rule and does need an agreement from the people and natural rights are rights that all people have but the agreement, is not a right, but an agreement, or in other words: contract.