Luisa likes to drink water from a plastic bottle. She knows the bottles were formed from synthetic polymers that were created in a chemical reaction. She also knows that synthetic materials can cause problems. Which statement explains the kind of problem that can develop from using synthetic materials such as plastic?
A. Plastics have changed the way people use materials.
B. Plastics have made the lives of people easier.
C. Plastics have contributed to more pollution.
D. Plastics have made more work for people.