Which of the following statements is true?a. No matter what the opportunity cost

Which of the following statements is true?a. No matter what the opportunity cost of production is it is always beneficial for two people to specialize according to their comparative advantage and trade with one another.b. Provided that the opportunity cost of production is different between two individuals it is always beneficial for the two people to specialize according to their comparative advantage and trade with one another.c. Trade has distributional impacts and that implies that trade based upon comparative advantage is always better for one individual than it is for the other individual.d. Only countries can benefit from specialization according to comparative advantage.