Final answer:
Materials can be classified as natural, synthetic, and mixed, focusing on the source and whether they are pure substances or mixtures. Natural materials come from nature, synthetic ones are man-made, and mixed materials combine different substances for specific properties.
Step-by-step explanation:
The classification of materials mentioned in the question pertains to Chemistry, specifically within the context of the classification of matter into different types based on their properties and origins. The classifications provided in the options are a combination of origins and types of materials, such as natural, synthetic, and the form they take (like plastic, leather, metal, etc.).
The correct answer to the question is b) Natural, synthetic, and mixed. This categorization captures the wide range of materials that we encounter, highlighting their sources (natural or synthetic) and whether they are pure substances or mixtures of various substances.