题目内容：
Which of the following, if true, would best support the density-dependent theory of population control?
A．As the number of foxes in Minnesota decrease, the growth rate of this population of foxes begins to in-crease. B．As the number of woodpeckers in Vermont decreases, the growth rate of this population of woodpeckers also begins to decrease.
C．After the number of prairie dogs in Oklahoma increases, the number of predators of these dogs also begins to increase.
D．After the number of beavers in Tennessee decreases, the number of predators of these beavers begins to increase.
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