Is polystyrene a mixture or pure substance

Polystyrene is a mixture substance. Polystyrene is a flexible plastic used to cater to different products ranging from food tupperwares to appliances. It is created by putting together, or polymerizing, styrene (building-block chemical and naturally existed in foods like strawberries, cinnamon, coffee and beef). When hard, it is used to make food packaging and laboratory equipments. When put together with different colors, additives or even plastics, it helps in making electronics, automobile parts, toys, appliances, gardening pots and equipment and many more

Are there options for this?

The best answer i can think of is b