Question ID:PT60 S1 Q17 Passage:Humankind would not have survived, as it clearly has, if our ancestors had not been motivated by the desire to sacrifice themselves when doing so would ensure the survival of their children or other close relatives. But since even this kind of sacrifice is a form of altruism, it follows that our ancestors were at least partially altruistic. Stem:Which one of the following arguments is most similar in its reasoning to the argument above? Correct Answer Choice:AChoice A:Students do not raise their grades if they do not increase the amount of time they spend studying. Increased study time requires good time management. However, some students do raise their grades. So some students manage their time well. Choice B:Organisms are capable of manufacturing their own carbohydrate supply if they do not consume other organisms to obtain it. So plants that consume insects must be incapable of photosynthesis, the means by which most plants produce their carbohydrate supplies. Choice C:If fragile ecosystems are not protected by government action their endemic species will perish, for endemic species are by definition those that exist nowhere else but in those ecosystems. Choice D:The natural resources used by human beings will be depleted if they are not replaced by alternative materials. But since such replacement generally requires more power, the resources used to create that power will become depleted. Choice E:Public buildings do not harmonize with their surroundings if they are not well designed. But any well-designed building is expensive to construct. Thus, either public buildings are expensive to construct or else they do not harmonize with their surroundings.