The word they in paragraph 4 refers to ______.

B

- Hướng dẫn giải

Đáp án B

Dẫn chứng: “Common man-made pollutants reaching the oceans include pesticides, herbicides, chemical fertilizers, detergents, oil, sewage, plastics, and other solids. Many of these pollutants collect at the ocean's depths, where they are consumed by small marine organisms and introduced into the global food chain.”