The huge difference in results after the robots were reprogrammed makes d the most logical conclusion: Sharing information can dramatically improve the productivity of a group. Choice A is incorrect for several reasons. First, self-interest and sharing aren’t exclusively human behaviors; animals are also driven by self-interest, and many animals also share (information, food, etc.). Second, the robots were programmed, not taught. The experiment doesn’t really show that the robots learned anything; they did what they were programmed to do, and as a result, they were more successful. Choice B is incorrect because the passage does not suggest that the robots were incorrectly programmed in the first experiment. Nothing indicates how the researchers felt about the results, so choice C is not a logical conclusion. Although the robots were far less productive when they were self-interested, choice E is not logical because they did indeed gather some pucks and because in many instances self-interest can result in highly productive behavior (e.g., self-preservation).