Which of the following nonferrous materials is included in Part B?

Part B specifically addresses nonferrous materials, which are metals that do not contain significant amounts of iron. Aluminum is one of the most widely used nonferrous metals due to its excellent corrosion resistance, lightweight nature, and high strength-to-weight ratio. It is commonly utilized in various industries, including aerospace, automotive, and construction, for components such as structural frames, vehicle bodies, and packaging materials.

In contrast, the other materials listed, steel and iron, are ferrous materials, which are primarily composed of iron and are magnetic. Acrylic is a polymer and not classified as a metal, thus falling outside the scope of nonferrous materials defined in Part B. Therefore, aluminum is the correct answer as it fits the criteria outlined for nonferrous materials.