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 economic principle of comparative advantage, where different regions focus on producing goods and services they can produce more efficiently. This leads to specialization, which can enhance productivity and efficiency in exchange. Additionally, the mention of better technologies underscores how advancements can facilitate trade and exchange, making it more efficient across regions.