Final answer:
Blocked currency is not specifically about an importer's inability to exchange local currency for the seller's currency; it involves broader exchange restrictions imposed by the government, making the statement false.
Step-by-step explanation:
In the context of blocked currency, blockage is typically accomplished by a country's government imposing restrictions on currency exchange, ensuring that the local currency cannot be freely exchanged for foreign currencies. This can be done to protect the local economy, control inflation, or preserve foreign reserves. However, it is not typically carried out by refusing to allow an importer to exchange national currency for the seller's currency. Instead, it involves broader measures that restrict exchanges by all entities within the country. Therefore, the correct answer to whether blockage is accomplished by refusing to allow an importer to exchange its national currency for the currency of the seller is B) False.