Final answer:
The property that is NOT conserved in nature is Density, as it can change under varying conditions, unlike Energy, Mass, and Charge which are conserved according to their respective conservation laws.
Step-by-step explanation:
The property that is NOT conserved in nature according to the options provided is Density (A). This is because, unlike Energy (B.), Mass (C.), and Charge (D.), density can change depending on the conditions such as pressure and temperature. Conservation laws in physics state that certain properties remain constant in a closed system. For instance, the law of conservation of energy indicates that total energy remains constant in an isolated system. Similarly, the law of conservation of mass and the law of conservation of charge indicates that mass and charge, respectively, do not change in the course of a closed-system reaction. However, density, which is mass per unit volume, can change if the volume of an object changes, even though the mass remains constant.