Concept:Oil pollution blocks oxygen from entering water, causing harm to organisms that live there.
Explanation:Aquatic animals need dissolved oxygen to survive.
An oil slick forms a layer over the surface of coastal water.
This layer obstructs the diffusion of oxygen from the air into the water.
As a result, the dissolved oxygen level in the water drops sharply.
The low oxygen level makes fish and other aquatic organisms suffocate and die.
Nitrification, detoxification, and disinfection are not effects of oil pollution.
Answer:A. destruction of aquatic life