___ is the material from which all known physical objects are made.

• A. Substance
• B. Mass
• C. Matter
• D. Energy

Answer: (C)

The term that refers to the material from which all known physical objects are composed is "matter." Matter encompasses everything that has mass and occupies space, existing in various forms such as solids, liquids, gases, and plasma. This definition is fundamental in both physics and chemistry, as it highlights the physical properties and interactions of materials in the universe.

The concept of mass pertains specifically to the quantity of matter in an object but does not encapsulate the broader category of all physical substances. Thus, while mass is an important aspect of matter, it does not accurately describe the entirety of what matter encompasses.

Substance refers to a specific kind of matter with a definite composition and distinct properties, which narrows the concept compared to the general term "matter." Energy, on the other hand, is not material; it is the capacity to do work or produce change but does not have physical form in the same way that matter does.

By understanding these distinctions, it's clear that "matter" is the most accurate answer when identifying the broad category that includes all physical objects.