What is concrete?

• A. A binding construction material used to make cement.
• B. A construction material made from cement, sand, aggregates, and water.
• C. A plastic polymer for textiles.
• D. A glass product.

Answer: (B)

Concrete is a composite construction material created by mixing cement, water, and aggregates such as sand and crushed stone. The cement acts as the binding agent; water initiates hydration to harden the mix, while the aggregates provide bulk and strength. This combination yields a durable, load‑bearing substance used in buildings and infrastructure. The other descriptions don’t fit: cement is the binder in concrete, not the material to make cement itself, and plastics or glass describe different materials altogether.