Which of the following best defines recyclable material?

Recyclable material is best defined as any discarded items that can be reused into another useful product. This definition encompasses a wide range of materials, such as metals, plastics, paper, and glass, which, when collected separately from general waste, can be processed and transformed into new products. The recycling process helps conserve natural resources, reduces the amount of waste sent to landfills, and minimizes environmental impact by reducing the need for raw material extraction.

Materials defined as recyclable must meet certain standards that allow them to endure processes of cleaning, remanufacturing, and reusing without contaminating or compromising quality. Emphasizing the idea of "discarded items" highlights the importance of proper waste management and separation at the source, which is crucial for effective recycling practices.

The other definitions do not accurately capture the essence of recyclable materials. Items that can be discarded do not imply any potential for reuse or environmental benefit. Non-biodegradable waste simply refers to materials that cannot decompose naturally, and materials that cannot be processed refer to those that cannot be turned into new products and therefore have no recycling potential.