The disruption of the carbon and nitrogen cycles affecting people will be least valuable if the results are inconclusive but might possibly be true. Thus, the correct option is B.
The carbon cycle may be defined as the movement of carbon and its derivatives through various biotic and abiotic components of an ecosystem.
The effect of disruption of nutrient cycles will be the least practical and useful if the outcome of it is not conclusive with respect to the deterioration of an ecosystem but might be conceivably true.
It impacts scientific research to a larger extent and allows it to affect the disruption of nutrient cycles in an ecosystem in a significant way.
Therefore, the correct option for this question is B.
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