Which term describes the amount of matter packed into a given space?

A. Heat

B. Temperature

C. Pressure

D. Density

Density, (D) is the answer. Heat and Temperature, we all should know what that is. And pressure is like pushing down on something or along those lines. Leaves us with density, the definition explained it.

The amount of matter (mass) packed into a given space is the density of that particular object or substance. (D)