C4 and CAM plants are Adaptations to arid environments.
An environment is known as arid environments, when there is much lack of water available for animal life and plantation. In this environment very less vegetation and animal life is present.
C3, C4 and CAM are the name of the proccess by which plants will consume the environmental carbon for the preparation of their foods in the form of carbohydrates. And these C4 & CAM plants will show adaptation to the arid environment.
Hence, option (A) is correct.
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