Concept:Oil forms a layer on the water surface, cutting off the larvae from the air they need to breathe.
Explanation:Mosquito larvae rise to the water surface and breathe atmospheric air through special breathing tubes called siphons.
When oil is poured over the water, it spreads into a thin, unbroken film on the surface.
This oily film blocks the breathing tubes, so the larvae cannot take in oxygen.
Since their oxygen supply is cut off, the larvae die from a lack of air.
This method of killing is called suffocation, not dehydration, poisoning, or starvation.
Answer:D. Suffocation