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The author of the passage is mainly concerned with
The passage presents statistics which disprove the common misconception that each country of the world belongs to either the First World or the Third World. It then explains that this common misconception comes from lack of access to those statistics.
This answer choice is too narrow. The author indeed mentions that our perceptions of the world are incorrect, but he or she discusses more than just our mistaken perceptions.
This answer choice is too narrow. The author uses the statistics which describe the true state of the world to make a point about our perceptions of the world and why we perceive the world in this way.
While the population percentiles above are mentioned in the passage, comparing them is not the main focus of the passage - they merely serve a an example of the perceived differences between the first and third world.
This answer choice is too general. The author discusses specific statistics, those which describe the true state of the world.