Which type of metal contains iron?

The correct answer is classified as ferrous metals, which are characterized by their iron content. Ferrous metals include a variety of materials that prominently feature iron, such as steel and cast iron. This iron content imparts specific properties, such as strength, ductility, and magnetic characteristics, making ferrous metals widely used in construction, manufacturing, and various applications that require durable materials.

In contrast, non-ferrous metals do not contain iron, which differentiates them from ferrous metals. Alloys can have iron as a component but are combinations of two or more elements, including metals, and do not specifically denote the presence of iron like ferrous metals do. Composite metals typically refer to materials made from different substances to achieve certain properties, which also do not specifically imply the inclusion of iron. Thus, ferrous metals are distinctly recognized for their iron content, making it the correct choice in this context.