What is the primary characteristic of reinforced concrete?

The primary characteristic of reinforced concrete is that it combines the compressive strength of concrete with the tensile strength of steel. This synergy allows reinforced concrete to perform exceptionally well in a variety of structural applications.

Concrete is exceptionally strong in compression, meaning it can withstand heavy loads pushing down on it without failing. However, concrete has very low tensile strength, which means it cannot easily resist forces that pull or stretch it apart. To overcome this limitation, steel reinforcement (such as rebar) is embedded within the concrete. Steel is very strong in tension, so it helps to support the concrete when it is subjected to tensile forces.

This combination results in a composite material that is well-suited for structural applications, such as beams, columns, and slabs in residential and commercial buildings. The ability to withstand both compressive and tensile forces allows for previously impossible designs and increased safety in construction.

The other options do not accurately describe reinforced concrete; it is not made solely of concrete, nor is it primarily composed of steel, nor is it limited to non-load bearing applications. These additional details highlight the unique benefits of reinforced concrete, making answer B the correct choice.