A scientist is designing an investigation to study the impact of UV radiation present in high-altitude habitats on the population of mountain yellow-legged frog. What type population is most likely to be a control group for the study?
(A) Mountain frogs in low-altitude habitats only
(B) Mountain frogs in their natural high-altitude habitat
(C) Mountain frogs in a lab setting exposed to UV rays from a sun lamp
(D)Mountain frogs in a lab setting with no UV ray exposure
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Option: C ............
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