Question

Which of the following best describes solids?

Answer 1

Answer: Option (D) is the correct answer.

Explanation:

Solids are the substances whose molecules are closely packed together due strong inter molecular forces between them. This causes the solid to have a fixed shape and volume.

Whereas density is mass divided by per unit volume.

Mathematically,         Density = $\frac{mass}{volume}$

Since, density is proportional to mass. So, more is the mass that is, more is the number of molecules held together by strong forces more will be its density.

Therefore, we can conclude that the statement solids are high in density and incompressible, best describes solids.

Answer 2

In my opinion I would pick D. 

Multiple answers could be chosen, just due to the fact that a solid is nothing more than just an object that cannot change it's physical shape into an object; just as water would. a solid can have a low density; such as paper, plastics, or even just a piece of wood. 

But think of a block of ice. You can break it, and crush it. It cannot be formed into any other shape. If you did break it, it only would make more ice fragments. And it's next phase is a liquid; if it were to be melted.