The correct answer is D. melamine.
Melamine is a thermosetting resin that is used to make a variety of products, including plastic crockery. It is a hard, durable material that is resistant to heat and water. Melamine is also non-toxic and does not leach chemicals into food.
Dacron is a polyester fiber that is used to make clothing, upholstery, and other textiles. Nylon is a polyamide fiber that is used to make clothing, carpets, and other textiles. Bakelite is a thermosetting resin that is used to make electrical insulators, cookware, and other products.
Melamine is the best choice for making plastic crockery because it is a hard, durable material that is resistant to heat and water. It is also non-toxic and does not leach chemicals into food.