Which Situation Is an Example of Density-Independent Population Regulation

Which situation is an example of density-independent population regulation?

A) An early cold spell kills 80 percent of the sparrows in a particular area.
B) When lemmings are abundant, arctic foxes switch their primary diet from mice to lemmings.
C) Lemming predators search widely for places where lemmings are abundant and concentrate their hunting in those areas.
D) A contagious disease sweeps through a dense population of squirrels but leaves a less-dense population relatively untouched.
E) An outbreak of an insect species depletes their food supply; the next generation of insects is underfed and produces few offspring.

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