Bunuel
Contrary to anthropologists' predictions, the size of remaining hunter-gatherer societies has not decreased in recent decades. Yet even though deforestation and the disappearance of traditional food sources have continued, the size of hunter-gatherer societies over the last ten years has increased by more than 5 percent over the previous ten years' levels.
Any of the following statements, if true about the last ten years, helps to explain the increase in the size of hunter-gatherer societies EXCEPT:
(A) The anthropologists' predictions are now known to have ignored several environmental factors that affect the survival of these societies.
(B) Many traditionally violent hunter-gatherer societies have been unusually peaceful, losing few men in battle with other tribes.
(C) State financial support, designed to allow hunter-gatherer societies to survive in their present form, increased by 20 percent.
(D) Wildlife conservation programs around the world have made it easier for these societies to successfully hunt big game.
(E) Droughts, which typically strike many of the regions where hunter-gatherer societies live every three to five years, have been mild.
Official Explanation
The passage provides some evidence that suggests that hunter-gatherer societies should be decreasing in number, but notes that they are increasing.
Four of the five choices will explain the increase; we're looking for the one that does not.
Choice (A) is correct- the validity of the predictions is irrelevant.
Whether or not the predictions were based on logical premises, this choice doesn't give us a reason why the size of these societies would increase.
Each of the other choices provides a reason why the size of the societies would increase.