Which of the following is NOT a claim made by GDP per capita (also known as "average income") in the Bowles reading? a. The 'hockey stick' graph illustrates exponential growth in all five countries examined. b. Average income has grown steadily for about 1000 years in five countries examined in figure 1. c. China and India experienced dramatic increases in average income later than Britain. d. Britain's average income experienced an exponential increase before the other four countries identified.