Which of the Following Is a Main Conclusion About Growth

Which of the following is a main conclusion about growth for OECD countries and the four rich countries examined in the chapter?

A) there has been a large increase in the standard of living since 1950.
B) the growth rates have decreased since the mid-1970s.
C) there has been a convergence of output per capita since 1950.
D) all of the above
E) none of the above