Question ID:PT87 S2 Q9 Passage:Ellen:  A group of economists and ecologists recently estimated the economic value of Earth's biosphere's "essential services," such as climate regulation, food, and water supplies, at $33 trillion annually. We should therefore make protection of the biosphere a high priority.Santiago:  I'm uncomfortable with the idea of calculating the biosphere's dollar value in order to justify protecting it. Such an approach implies that the biosphere's most important value lies in the "services" it provides us. Stem:On the basis of their dialogue, it can most reasonably be concluded that Ellen and Santiago disagree over the truth of which one of the following statements? Correct Answer Choice:AChoice A:Estimating the dollar value of the biosphere's essential services is an appropriate way of providing a rationale for making protection of the biosphere a high priority. Choice B:The biosphere's most important value lies in something other than the services it provides to human beings. Choice C:Calculating the dollar value of the biosphere's essential services is the most effective way to ensure that protecting the biosphere is treated as a matter of urgency. Choice D:The idea that the dollar value of the biosphere's essential services can be accurately calculated is unrealistic. Choice E:Calculating the dollar value of the biosphere's essential services implies that the biosphere's most important value lies in the services it provides to human beings.