The statement that provides an accurate description of plastic is: "plastic as a synthetic material made from mostly renewable natural resources."
While some plastics can be derived from renewable resources (like bioplastics made from corn or sugarcane), the majority of traditional plastics are derived from nonrenewable petroleum resources. Therefore, stating that plastics are made from "mostly renewable natural resources" can be misleading for conventional plastics.
The clearest and most accurate statement would be a recognition that plastics can be synthetic materials and can derive from both renewable and nonrenewable sources, depending on the type of plastic in question. This nuance is important for a comprehensive understanding of plastic materials.