Columnist: Much of North America and western Europe is more heavily forested and has less acid rain and better air quality now than five decades ago. Though this may be due largely to policies advocated by environmentalists, it nonetheless lends credibility to the claims of people who reject predictions of imminent ecological doom and argue that environmental policies that excessively restrict the use of natural resources may diminish the wealth necessary to adopt and sustain the policies that brought about these improvements. Which one of the following, if true, most strengthens the columnist's reasoning? ["The more advanced the technology used in a nation's industries, the greater is that nation's ability to devote a portion of its resources to social programs.", "The concern demonstrated by a nation for the health and integrity of its natural ecosystems leads to an increase in that nation's wealth.", 'Nations sustain their wealth largely through industrial use of the natural resources found within their boundaries.', 'A majority of ecological disasters arise from causes that are beyond human control.']