Which of the following refers to 'composite' in German?

The term 'composite' in German is accurately translated as 'Verbundstoff'. This term is commonly used in various fields such as materials science and engineering, where it represents a material made from two or more constituent materials with significantly different physical or chemical properties. When these materials come together, they create a composite that possesses qualities that are superior to those of the individual components.

In contrast, the other options refer to different concepts. 'Verunreinigung' translates to 'contamination', which does not relate to composite materials. 'Mischung' means 'mixture', which could potentially encompass composites but is more general and doesn’t reflect the specialized use of 'Verbundstoff'. 'Klammer' translates to 'clip' or 'bracket', which is completely unrelated to the concept of composites. Thus, 'Verbundstoff' is the precise term to denote 'composite' in the German language context.