The beetle population moved to a greener habitat. So, the correct option is (a). This falls under camouflage.
If the bettle relocated to a greener location, they would probably continue to blend in by remaining green. Camouflage-dependent species either evolved to accommodate the new environment or went extinct. Due to alterations in the species, the process of industrial melanism is referred to as micro-evolution.
For example, due of their superior camouflage on clean trees, white-bodied peppered moths were more common in England before industrialization than those with black bodies. The soot from pollution that the trees began to gather as industrialization got underway made it easy for birds to eat the white moths since they stood out against the black background.
The fact that birds could not easily identify the black bodied moths against dark backgrounds gave them a survival advantage.This made the black bodies moths to be naturally selected and they increased in numbers. This is a perfect example of natural selection put forth by Darwin.
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