Which condition in an ecosystem would be considered a disturbance, as opposed to a stress?

Question

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A disturbance is a sudden change in an ecosystem that alters the availability of resources or the physical environment. Floods can cause sudden changes to an ecosystem and are therefore considered a disturbance rather than a stress. In this case, the flood covered a large floodplain area with water and sediment, killing plants, which is a sudden and dramatic change to the ecosystem. Choices A, B, C, and D are stressors as they represent more gradual or chronic changes to the ecosystem.

Which Condition in an Ecosystem Would Be Considered a Disturbance