The Heckscher-Ohlin theory predicts that t he opening of trade between a land-abundant country and a labor-abundant country should result in : a. higher rents and wages in both countries. b. lower rents and wages in both countries. c. higher rents in the labor-abundant country and higher wages in the land-abundant country. d. higher wages in the labor-abundant country and higher rents in the land-abundant country.