On average, each American produces 4 pounds of trash each day (1,460 pounds of trash each year). To contain this trash, landfills are constructed. In what way do landfills primarily endanger ecosystems? A. They inhibit the recycling of materials, such as aluminum or paper. B. They could decrease the production of acid rain. C. They could contaminate surface and ground water sources. D. They encourage the rapid spread of infectious diseases.