Hello, Thebestdog2555. Your best answer would be A - Land and water environments. Since there is a lot of rainfall which ultimately causes runoff of fertilizers and pesticides, it will go into the ocean and this is how the land helps pollute the water. As for the water part, a lot of it starts as the air pollution which can be trapped into the ocean as well, causing oxygen depletion. I hope I helped!! Let me know if I can answer any more questions. Have a great day!! :)