The option that best analyzes how exchange becomes more efficient at a national scale is:
Places within a country specialize based on comparative advantage, meanwhile better technologies enable exchange.
This option highlights the importance of specialization, which allows regions or places to focus on what they do best, leading to more efficient production and exchange. Additionally, advancements in technology facilitate these exchanges, making it easier and quicker to trade goods and services across the country. This combination of specialization and enhanced technology contributes significantly to the efficiency of exchange on a national scale.