When the nation of Worldova allows trade and becomes an exporter of silk, a. residents of Worldova who produce silk become better off; residents of Worldova who buy silk become worse off; and the economic well-being of Worldova falls. b. residents of Worldova who produce silk become better off; residents of Worldova who buy silk become worse off; and the economic well-being of Worldova rises. c. residents of Worldova who produce silk become worse off; residents of Worldova who buy silk become better off; and the economic well-being of Worldova rises. d. residents of Worldova who produce silk become worse off; residents of Worldova who buy silk become better off; and the economic well-being of Worldova falls