According to the Stolper-Samuelso n theorem, a n increase in the price of a country’s imports w ill : a. r educe the returns to all factors of production within the country. b. raise the returns to all factors of production within the country. c. reduce the returns to the factor of production used relatively intensively in the import-competing industry. d. raise the returns to the factor of production used intensively in the import-competing industry.