The economic growth model predicts that ▼ rich countries poor countries will grow faster than ▼ rich countries poor countries . Which of the following best explains what is actually happening to real per capita GDPs of​ countries?
A. Most countries now have similar real per capita GDP levels.
B. ​Lower-income countries have not caught up to​ higher-income countries at all.
C. Poor countries are generally catching up with rich countries.
D. ​Lower-income industrial countries are catching up with​ higher-income industrial countries.