If Sweden Exports Cell Phones to Denmark and Denmark Exports

If Sweden exports cell phones to Denmark and Denmark exports butter to Sweden,which of the following would explain this pattern of trade?

A) Sweden has a lower opportunity cost of producing cell phones than Denmark and Denmark has a comparative advantage in producing butter.
B) The opportunity cost of producing butter in Denmark is higher than the opportunity cost of producing butter in Sweden.
C) Sweden must have an absolute advantage in producing cell phones and Denmark must have an absolute advantage in producing butter.
D) Sweden has a higher opportunity cost of producing cell phones than Denmark,and Denmark has a higher opportunity cost of producing butter.