This is a correct answer because it refers to political and philosophical doctrine according to which individuals are sometimes giving up on their natural freedoms, so they could gain more political rights. It was an idea of John Locke mostly, but also of Enlightenment period.
All other answers are wrong, because they have the same basis, and that is that someone has a natural right (given to him by God or some other natural force) to decide in the name of the others.
