Many kangaroo rats live in the Sonoran Desert of the southwestern United States. They have a variety of adaptations for living in the desert.
Under which circumstance would the kangaroo rats of the Sonoran Desert be MOST LIKELY to develop new adaptations by natural selection?

A. Variations decrease among the kangaroo rats of the Sonoran Desert
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B. The climate of the Sonoran Desert becomes colder and wetter.
C. The climate of the Sonoran Desert remains constant for many years.
D. Natural predators of the Sonoran Desert kill many kangaroo rats each year.