please answer all three

Which of the following international trade scholars was the first to explain why unrestricted free trade is beneficial to a country? Select one: O A. Eli Heckscher OB. Adam Smith OC. Bertil Ohlin O D. Paul Krugman OE David Ricardo A situation in which a country specializes in producing the goods it produces most efficiently and buys the products it produces less efficiently from other countries, even if it could produce the good more efficiently itself is referred to as: Select one A comprehensive advantage OB. pertinent advantage O absolute advantage DD inherent advantage E comparative advantage Which of the following is a situation in which all countries can benefit, even if some benefit more than others? Select one: O A Positive-sum game OB Balanced Scorecard OC Economic progression OD. Near equivalent-result game O E Zero-sum game