Which of the following about economic freedom is true? a. low income countries that have adopted institutions and policies consistent with economic freedom have grown rapidly. b. low-income countries that have adopted institutions and policies consistent with economic freedom have failed to grow more rapidly than economies that are relatively unfree. c. economic freedom appears to improve the performance of developed economies, but not those that are less developed. d. economic freedom appears to improve the performance of less developed economies, but not those that already have a high degree of development.