How does the last sentence in paragraph 7 refine a key concept about road construction?
A. The cost of the latest technology delays plans for building safer and more durable roads.
B. Solar roads provide a less costly solution to building safe and fuel-saving roads.
C. Energy-saving techniques used in road construction are not available in the near future.
D. The cost of construction poses an obstacle to building safer and more durable roads.
How does the last sentence in paragraph 7 refine a key concept about road construction?
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D. The cost of construction poses an obstacle to building safer and more durable roads.
Explanation: The last sentence in paragraph 7 likely emphasizes the financial challenges involved in implementing better road construction practices. It suggests that high costs can prevent the adoption of newer, safer technologies, thus refining the concept that economic factors significantly impact road construction quality and safety.