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Comprehensive and Detailed Explanation:

The correct answer is B because it captures the central idea presented throughout the passage. The author acknowledges that public transportation systems require substantial financial investment, but the emphasis is on the advantages that supporters believe these systems provide. The passage specifically mentions improved mobility, reduced pollution, and support for economic growth. These points collectively support the idea that the benefits may outweigh the costs.

Choice A is incorrect because the passage states the opposite: transportation systems require “significant investment.” Choice C is incorrect because the passage does not claim that congestion can never be eliminated. Instead, it discusses efforts to reduce congestion. Choice D is also incorrect because the passage does not suggest that transportation is the sole factor influencing economic growth.

Reading questions aligned with THEA objectives often require students to identify a passage’s main idea, determine the author’s purpose, and distinguish central arguments from unsupported conclusions. Successful readers focus on the overall message rather than isolated details. By examining how the supporting details relate to one another, readers can identify the author’s primary point. In this case, all supporting details reinforce the idea that public transportation offers important advantages despite its expense.