Comparative advantage means ______.

a. That nations or areas that export goods will necessarily be able to produce those goods or services more cheaply than other nations in an absolute sense

b. A country, or a region, should specialize in producing and selling those items that it can produce at a lower opportunity cost than other regions or countries

c. Both that nations or areas that export goods will necessarily be able to produce those goods or services more cheaply than other nations in an absolute sense and means a country, or a region, should specialize in producing and selling those items that it can produce at a lower opportunity cost than other regions or countries are true

d. Neither that nations or areas that export goods will necessarily be able to produce those goods or services more cheaply than other nations in an absolute sense nor means a country, or a region, should specialize in producing and selling those items that it can produce at a lower opportunity cost than other regions or countries is true