I have a problem in economics on Exchange and Specialization. Please help me in getting the right answer from the following question. Sarah the wheat farmer would be most probable to trade for fruit from the Kathy's orchard if: (i) Sarah's opportunity cost to generate wheat is relatively lower. (ii) Both Kathy and Sarah specialize to decrease costs. (iii) Sarah consists of a comparative benefit in wheat. (iv) Sarah encompasses the higher opportunity cost for the fruit. (v) All of the above.
What is the right answer?