Answer:
A gravitational singularity is a one-dimensional point which contains a huge mass in an infinitely small space.
Explanation:
A gravitational singularity lies in the center of a black hole. A gravitational singularity is a one-dimensional point which contains a huge mass in an infinitely small space. In this infinitely small space, density and gravity become infinite and the laws of physics cease to operate.
I believe the answer is: D. Popular Sovereignty
Popular sovereignty refers the principle of government which ruled by the will from the majority of the people.
In democratic country such as united states (and most of the countries in western hemisphere) , this would be included in most state constitutions.