Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A country has a comparative advantage in producing a good if:
Option A:it is able to produce the good at a lower cost than its trading partner.
Option B:its opportunity cost of producing the good is less than that of its trading partner.
Option C:its opportunity cost of producing the good is more than that of its trading partner.

Answer: B