Final answer:
The U.S. experienced rapid economic growth in the 1960s and the slowest growth during the Great Depression, making option B the correct answer.
Step-by-step explanation:
The question deals with the historical growth rates of U.S. real GDP per capita over the past century. Regarding economic growth, the U.S. experienced various phases with differing growth rates due to a number of factors including policies, technology innovation, and global economic conditions.
When considering the provided information, we can infer that the 1960s were a period of rapid economic growth in multiple economies, including Japan and some Latin American countries like Brazil, with high rates of GDP per capita growth. This suggests that the U.S. likely experienced a high growth rate during this period as well.
On the other hand, the Great Depression was a period renowned for severe economic downturn, which implies that it was a time where the U.S. experienced some of its weakest years of productivity growth.
The correct answer is likely to be during the 1960s; and the slowest during the Great Depression. Therefore, the answer is B. 1960s; Great Depression.